Difference between revisions of "Unit DS1307"

Latest revision as of 04:11, 24 April 2018

`DS1307_REG_CONTROL_OUT = $80;`	Output Control (Output level of SQW/OUT pin when SQWE = 0)
`DS1338_REG_CONTROL_OSF = $20;`
`DS1307_REG_CONTROL_SQWE = $10;`	Square-Wave Enable (When set to 1, enables the oscillator output)
`DS1307_REG_CONTROL_RS1 = $02;`	Rate Select 1 (See datasheet for values)
`DS1307_REG_CONTROL_RS0 = $01;`	Rate Select 2 (See datasheet for values)

DS1337 control register DS1337_REG_CONTROL_*

`DS1337_REG_CONTROL_nEOSC = $80;`
`DS1339_REG_CONTROL_BBSQI = $20;`
`DS3231_REG_CONTROL_BBSQW = $40;`	same as BBSQI
`DS1337_REG_CONTROL_RS2 = $10;`
`DS1337_REG_CONTROL_RS1 = $08;`
`DS1337_REG_CONTROL_INTCN = $04;`
`DS1337_REG_CONTROL_A2IE = $02;`
`DS1337_REG_CONTROL_A1IE = $01;`

DS1340 control register DS1340_REG_CONTROL_*

`DS1340_REG_CONTROL_OUT = $80;`
`DS1340_REG_CONTROL_FT = $40;`
`DS1340_REG_CONTROL_CALIB_SIGN = $20;`
`DS1340_REG_CONTROL_M_CALIBRATION = $1f;`

DS1340 flag register DS1340_REG_FLAG_*

`DS1340_REG_FLAG_OSF = $80;`

DS1337 status register DS1337_REG_STATUS_*

`DS1337_REG_STATUS_OSF = $80;`
`DS1337_REG_STATUS_A2I = $02;`
`DS1337_REG_STATUS_A1I = $01;`

RX8025 control1 register RX8025_REG_CONTROL1_*

`RX8025_REG_CONTROL1_2412 = $20;`

RX8025 control2 register RX8025_REG_CONTROL2_*

`RX8025_REG_CONTROL2_PON = $10;`
`RX8025_REG_CONTROL2_VDET = $40;`
`RX8025_REG_CONTROL2_XST = $20;`

Type definitions

DS1307 RTC time

PDS1307RTCTime = ^TDS1307RTCTime;

TDS1307RTCTime = array[0..6] of Byte;

DS1307 RTC device

PDS1307RTCDevice = ^TDS1307RTCDevice;

TDS1307RTCDevice = record

RTC Properties
`RTC:TRTCDevice;`
DS1307 Properties
`I2C:PI2CDevice;`	The I2C device this RTC is connected to
`Address:Word;`	The I2C address of the device
`Chip:LongWord;`	The chip type (eg DS1307_CHIP_DS1307)
`RTCReg:Byte;`	The register offset for the RTC
`NVRAMReg:Byte;`	The register offset for the NVRAM
`NVRAMSize:Byte;`	The NVRAM size
`ControlReg:Byte;`	The control register offset
Statistics Properties
`ReadCount:LongWord;`	Number of direct RTC/NVRAM/Control reads to the device
`WriteCount:LongWord;`	Number of direct RTC/NVRAM/Control writes to the device

Public variables

None defined

Function declarations

Initialization functions

procedure DS1307Init;

Description: To be documented

Note	None documented

DS1307 RTC functions

function DS1307RTCStart(RTC:PRTCDevice):LongWord;

Description: Implementation of RTCDeviceStart API for DS1307 RTC

Note	Not intended to be called directly by applications, use RTCDeviceStart instead.

function DS1307RTCStop(RTC:PRTCDevice):LongWord;

Description: Implementation of RTCDeviceStop API for DS1307 RTC

Note	Not intended to be called directly by applications, use RTCDeviceStop instead.

function DS1307RTCGetTime(RTC:PRTCDevice):Int64;

Description: Implementation of RTCDeviceGetTime API for DS1307 RTC

Note	Not intended to be called directly by applications, use RTCDeviceGetTime instead.

function DS1307RTCSetTime(RTC:PRTCDevice; const Time:Int64):Int64;

Description: Implementation of RTCDeviceSetTime API for DS1307 RTC

Note	Not intended to be called directly by applications, use RTCDeviceSetTime instead.

DS1307 helper functions

function DS1307ReadRTC(RTC:PRTCDevice; Buffer:Pointer; Size:LongWord):LongWord;

Description: To be documented

Note	None documented

function DS1307WriteRTC(RTC:PRTCDevice; Buffer:Pointer; Size:LongWord):LongWord;

Description: To be documented

Note	None documented

function DS1307ReadNVRAM(RTC:PRTCDevice; Offset:Byte; Buffer:Pointer; Size:LongWord):LongWord;

Description: To be documented

Note	None documented

function DS1307WriteNVRAM(RTC:PRTCDevice; Offset:Byte; Buffer:Pointer; Size:LongWord):LongWord;

Description: To be documented

Note	None documented

function DS1307ReadControl(RTC:PRTCDevice; var Control:Byte):LongWord;

Description: To be documented

Note	None documented

function DS1307WriteControl(RTC:PRTCDevice; Control:Byte):LongWord;

Description: To be documented

Note	None documented

function DS1307DefaultRTCTime(RTC:PRTCDevice; Buffer:Pointer; Size:LongWord):Boolean;

Description: To be documented

Note	None documented

function DS1307FileTimeToRTCTime(RTC:PRTCDevice; const FileTime:Int64; Buffer:Pointer; Size:LongWord):Boolean;

Description: To be documented

Note	None documented

function DS1307RTCTimeToFileTime(RTC:PRTCDevice; Buffer:Pointer; Size:LongWord; var FileTime:Int64):Boolean;

Description: To be documented

Note	None documented

Return to Unit Reference

`DS1307_RTC_DESCRIPTION = 'Maxim DS1307 Real Time Clock';`	Description of DS1307 device

`DS1307_MIN_TIME = 125911584000000000;`	Time starts at 01/01/2000 00:00:00 (MM/DD/YY HH:MM:SS)
`DS1307_MAX_TIME = 157469183990000000;`	Time ends at 12/31/2099 23:59:59 (MM/DD/YY HH:MM:SS)

`DS1307_CHIP_DS1307 = 0;`
`DS1307_CHIP_DS1337 = 1;`
`DS1307_CHIP_DS1338 = 2;`
`DS1307_CHIP_DS1339 = 3;`
`DS1307_CHIP_DS1340 = 4;`
`DS1307_CHIP_DS1388 = 5;`
`DS1307_CHIP_DS3231 = 6;`
`DS1307_CHIP_M41T00 = 7;`
`DS1307_CHIP_MCP794XX = 8;`
`DS1307_CHIP_RX8025 = 9;`

`DS1307_REG_SECONDS = $00;`	00-59
`DS1307_REG_MINUTE = $01;`	00-59
`DS1307_REG_HOUR = $02;`	00-23 (or 1-12am,pm)
`DS1307_REG_WEEKDAY = $03;`	01-07
`DS1307_REG_DAY = $04;`	01-31
`DS1307_REG_MONTH = $05;`	01-12
`DS1307_REG_YEAR = $06;`	00-99

`DS1307_REG_CONTROL = $07;`	Also DS1338
`DS1337_REG_CONTROL = $0e;`
`DS1340_REG_CONTROL = $07;`
`DS1340_REG_FLAG = $09;`
`DS1337_REG_STATUS = $0f;`
`DS1339_REG_ALARM1_SECONDS = $07;`
`RX8025_REG_CONTROL1 = $0e;`
`RX8025_REG_CONTROL2 = $0f;`

`DS1307_REG_SECONDS_CH = $80;`	Clock Halt bit (1 to Disable/0 to Enable the clock)
`DS1340_REG_SECONDS_nEOSC = $80;`
`MCP794XX_REG_SECONDS_ST = $80;`	Clock Stop Bit (1 to Enable/0 to Disable the clock)

Difference between revisions of "Unit DS1307"

Latest revision as of 04:11, 24 April 2018

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@@ Line 4: / Line 4: @@
 === Description ===
 ----
+'''Maxim DS1307 Real Time Clock Driver unit'''
 The Maxim DS1307 is an I2C interface, battery backed real time clock chip with full BCD clock and calendar and 56 bytes of software accessible NVRAM. The chip supports 12 or 24 hour format and is widely used in low cost RTC devices available from a range of suppliers.
@@ Line 33: / Line 35: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 chip constants''' <code> DS1307_CHIP_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 chip''' <code> DS1307_CHIP_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 71: / Line 73: @@
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 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 RTC register constants''' <code> DS1307_REG_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 RTC register''' <code> DS1307_REG_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 100: / Line 102: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 control and status register constants''' <code> DS1307_REG_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 control and status register''' <code> DS1307_REG_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 132: / Line 134: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 seconds register constants''' <code> DS1307_REG_SECONDS_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 seconds register''' <code> DS1307_REG_SECONDS_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
 | <code>DS1307_REG_SECONDS_CH = $80;</code>
-| Clock Halt bit (1 to Disable / 0 to Enable the clock)
+| Clock Halt bit (1 to Disable/0 to Enable the clock)
 |-
 | <code>DS1340_REG_SECONDS_nEOSC = $80;</code>
@@ Line 143: / Line 145: @@
 |-
 | <code>MCP794XX_REG_SECONDS_ST = $80;</code>
-| Clock Stop Bit (1 to Enable / 0 to Disable the clock)
+| Clock Stop Bit (1 to Enable/0 to Disable the clock)
 |-
 |}
@@ Line 149: / Line 151: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 hour register constants''' <code> DS1307_REG_HOUR_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 hour register''' <code> DS1307_REG_HOUR_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
 | <code>DS1307_REG_HOUR_12HR = $40;</code>
-| 12/24 hour bit (1 = 12 hour mode / 0 = 24 hour mode)
+| 12/24 hour bit (1 = 12 hour mode/0 = 24 hour mode)
 |-
 | <code>DS1307_REG_HOUR_PM = $20;</code>
-| AM/PM bit (1 = PM / 0 = AM) (Only in 12 hour mode)
+| AM/PM bit (1 = PM/0 = AM) (Only in 12 hour mode)
 |-
 | <code>DS1340_REG_HOUR_CENTURY_EN = $80;</code>
@@ Line 169: / Line 171: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''MCP794XX weekday register constants''' <code> MCP794XX_REG_WEEKDAY_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''MCP794XX weekday register''' <code> MCP794XX_REG_WEEKDAY_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
 | <code>MCP794XX_REG_WEEKDAY_VBATEN = $08;</code>
-| Battery Backup Enabled (1 to Enable / 0 to Disable)
+| Battery Backup Enabled (1 to Enable/0 to Disable)
 |-
 |}
@@ Line 180: / Line 182: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1337 month register constants''' <code> DS1337_REG_MONTH_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1337 month register''' <code> DS1337_REG_MONTH_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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 <br />
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-<div style="font-size: 14px; padding-left: 12px;">'''DS1307 control register constants''' <code> DS1307_REG_CONTROL_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1307 control register''' <code> DS1307_REG_CONTROL_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 214: / Line 216: @@
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 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1337 control register constants''' <code> DS1337_REG_CONTROL_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1337 control register''' <code> DS1337_REG_CONTROL_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 246: / Line 248: @@
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-<div style="font-size: 14px; padding-left: 12px;">'''DS1340 control register constants''' <code> DS1340_REG_CONTROL_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1340 control register''' <code> DS1340_REG_CONTROL_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 266: / Line 268: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''DS1340 flag register constants''' <code> DS1340_REG_FLAG_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1340 flag register''' <code> DS1340_REG_FLAG_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 277: / Line 279: @@
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-<div style="font-size: 14px; padding-left: 12px;">'''DS1337 status register constants''' <code> DS1337_REG_STATUS_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''DS1337 status register''' <code> DS1337_REG_STATUS_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 294: / Line 296: @@
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-<div style="font-size: 14px; padding-left: 12px;">'''RX8025 control1 register constants''' <code> RX8025_REG_CONTROL1_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''RX8025 control1 register''' <code> RX8025_REG_CONTROL1_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 305: / Line 307: @@
 <br />
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
-<div style="font-size: 14px; padding-left: 12px;">'''RX8025 control2 register constants''' <code> RX8025_REG_CONTROL2_* </code></div>
+<div style="font-size: 14px; padding-left: 12px;">'''RX8025 control2 register''' <code> RX8025_REG_CONTROL2_* </code></div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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@@ Line 325: / Line 327: @@
 ----
-''To be documented''
+'''DS1307 RTC time'''
+<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
+<code>PDS1307RTCTime = ^TDS1307RTCTime;</code>
+<code>TDS1307RTCTime = array[0..6] of Byte;</code>
+<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
+{| class="wikitable" style="font-size: 14px; background: white;"
+|-
+| &nbsp;
+| style="width: 50%;"|&nbsp;
+|-
+|}
+</div></div>
+'''DS1307 RTC device'''
+<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
+<code>PDS1307RTCDevice = ^TDS1307RTCDevice;</code>
+<code>TDS1307RTCDevice = record</code>
+<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
+{| class="wikitable" style="font-size: 14px; background: white;"
+|-
+|colspan="2"|''RTC Properties''
+|-
+| <code>RTC:TRTCDevice;</code>
+| &nbsp;
+|-
+|colspan="2"|''DS1307 Properties''
+|-
+| <code>I2C:PI2CDevice;</code>
+| The I2C device this RTC is connected to
+|-
+| <code>Address:Word;</code>
+| The I2C address of the device
+|-
+| <code>Chip:LongWord;</code>
+| The chip type (eg DS1307_CHIP_DS1307)
+|-
+| <code>RTCReg:Byte;</code>
+| The register offset for the RTC
+|-
+| <code>NVRAMReg:Byte;</code>
+| The register offset for the NVRAM
+|-
+| <code>NVRAMSize:Byte;</code>
+| The NVRAM size
+|-
+| <code>ControlReg:Byte;</code>
+| The control register offset
+|-
+|colspan="2"|''Statistics Properties''
+|-
+| <code>ReadCount:LongWord;</code>
+| Number of direct RTC/NVRAM/Control reads to the device
+|-
+| <code>WriteCount:LongWord;</code>
+| Number of direct RTC/NVRAM/Control writes to the device
+|-
+|}
+</div></div>
+<br />
 === Public variables ===
 ----
-''To be documented''
+''None defined''
 === Function declarations ===
@@ Line 344: / Line 409: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 355: / Line 420: @@
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 <pre style="border: 0; padding-bottom:0px;">function DS1307RTCStart(RTC:PRTCDevice):LongWord;</pre>
-<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
+<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of RTCDeviceStart API for DS1307 RTC</div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
-| None documented
+| Not intended to be called directly by applications, use RTCDeviceStart instead.
 |-
 |}
@@ Line 367: / Line 432: @@
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 <pre style="border: 0; padding-bottom:0px;">function DS1307RTCStop(RTC:PRTCDevice):LongWord;</pre>
-<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
+<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of RTCDeviceStop API for DS1307 RTC</div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
-| None documented
+| Not intended to be called directly by applications, use RTCDeviceStop instead.
 |-
 |}
@@ Line 379: / Line 444: @@
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 <pre style="border: 0; padding-bottom:0px;">function DS1307RTCGetTime(RTC:PRTCDevice):Int64;</pre>
-<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
+<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of RTCDeviceGetTime API for DS1307 RTC</div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
-| None documented
+| Not intended to be called directly by applications, use RTCDeviceGetTime instead.
 |-
 |}
@@ Line 391: / Line 456: @@
 <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 <pre style="border: 0; padding-bottom:0px;">function DS1307RTCSetTime(RTC:PRTCDevice; const Time:Int64):Int64;</pre>
-<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
+<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of RTCDeviceSetTime API for DS1307 RTC</div>
 <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
-| None documented
+| Not intended to be called directly by applications, use RTCDeviceSetTime instead.
 |-
 |}
@@ Line 410: / Line 475: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 422: / Line 487: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 434: / Line 499: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 446: / Line 511: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 458: / Line 523: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 470: / Line 535: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 482: / Line 547: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 494: / Line 559: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-
@@ Line 506: / Line 571: @@
 {| class="wikitable" style="font-size: 14px; background: white;"
 |-
-! '''Note'''
+! Note
 | None documented
 |-

`DS1307_REG_HOUR_12HR = $40;`	12/24 hour bit (1 = 12 hour mode/0 = 24 hour mode)
`DS1307_REG_HOUR_PM = $20;`	AM/PM bit (1 = PM/0 = AM) (Only in 12 hour mode)
`DS1340_REG_HOUR_CENTURY_EN = $80;`
`DS1340_REG_HOUR_CENTURY = $40;`