STK17T88Document Number: 001-52040 Rev. *A Page 17 of 22
RTC Register Map
*A binary value, not a BCD value.
0 - Not implemented, reserved for future use.
Default Settings of nonvolatile Calibration and Interrupt registers from factory
Calibration Register=00h
Interrupt Register=00h
The User should configure to the desired value at startup or during operation and the value is then retained during a power failure.
[ ] designates values shipped from the factory. See Stopping and Starting the RTC Oscillator on page 14.
Register BCD Format Data Function / Range
D7 D6 D5 D4 D3 D2 D1 D0
0x7FFF 10s Years Years Years: 00-99
0x7FFE 0 0 0 10s
Months Months Months: 01-12
0x7FFD 0 0 10s Day of Month Day of Month Day of Month: 01-31
0x7FFC 0 0 0 0 0 Day of Week Day of week: 01-07
0x7FFB 0 0 10s Hours Hours Hours: 00-23
0x7FFA 0 10s Minutes Minutes Minutes: 00-59
0x7FF9 0 10s Seconds Seconds Seconds: 00-59
0x7FF8 OSCEN
[0] 0Cal
Sign Calibration [00000] Calibration values*
0x7FF7 WDS WDW WDT Watchdog*
0x7FF6 WI E[0] AIE[0] PFE[0] 0 H/L [1] P/L [0] 0 0 Interrupts*
0x7FF5 M 0 10s Alarm Date Alarm Day Alarm, Day of Month: 01-31
0x7FF4 M 0 10s Alarm Hours Alarm Hours Alarm, hours: 00-23
0x7FF3 M 10 Alarm Minutes Alarm Minutes Alarm, minutes: 00-59
0x7FF2 M 10 Alarm Seconds Alarm Seconds Alarm, seconds: 00-59
0x7FF1 10s Centuries Centuries Centuries: 00-99
0x7FF0 WDF AF PF OSCF 0 CAL[0] W[0] R[0] Flags*
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