ST M41T00AUD, Manual

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M41T00AUD M41T00AUD clock operation
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Table 4. M41T00AUD register map
(1)
Bit
Register name Range
Addr D7 D6 D5 D4 D3 D2 D1 D0
00h ST 10 seconds Seconds Seconds 00-59
01h
0
(2)
10 minutes Minutes Minutes 00-59
02h CEB CB 10 hours Hours (24 hour format) Century/hours 0-1/00-23
03h 0
Y
(3)
Y Y 0 Day of week Day 1-7
04h 0 0 10 date Date: day of month Date 01-31
05h 0 0 0 10M Month Month 01-12
06h 10 years Year Year 00-99
07h OUT FT S <------------- Calibration ------------> Cal/control
08h 256/512 TONE TCH2 MUTE <--------------GAIN ------------> Audio
09h HT TCFE OF OFIE TCHE3 TCHE2 TCHE1 TCHE0 Control2
1. Key:
S = SIGN bit
FT = Frequency Test bit'
ST = STOP bit
OF = Oscillator Fail Detect Flag
OFIE = Oscillator Fail Interrupt Enable
OUT = Logic Output
TCHE3:TCHEO = Trickle Charge Enable bits
TCFE = Trickle Charge FET bypass Enable
HT = Halt bit
TCH2 = Trickle Charge Enable #2
TONE = Tone on/off select
CB = Century bit
CEB = Century Enable bit
256/512 = Tone frequency select bit
2. 0 bits always read as 0. Writing them has no effect.
3. Y bits are indeterminate at power-up. These are the factory test mode bits, and must be written to 0.