stled325 STMicroelectronics, stled325 Datasheet - Page 20

• Manufacturer Part Number: stled325
• Description: I?c Interfaced, Advanced Led Controller/driver With Keyscan, Standby Power Management And Real Time Clock Rtc
• Manufacturer: STMicroelectronics

Functional description
3.11.2
3.11.3
Table 2.
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Addr
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
WDFEn
OSC_S
RPT4
RPT3
RPT2
RPT1
12/24
Rsvd
Rsvd
Rsvd
MD_HM_MS
CB1
RB2
AFE
D7
T
Writing to the real time clock
The time and date may be set by writing to the RTC registers. The new RTC time can be
updated by writing to the RTC registers. The new time only takes affect after a complete
write cycle. If the write cycle is incomplete, the new time value is discarded. A single byte
may be written to the RTC without affecting the other bytes.
Register table for RTC
Register table for RTC
Legend:
Cal_Sign = Sign bit
OSC_ST = Oscillator Stop bit
BMB0 – BMB4 = watchdog multiplier bits
CB = Century bits
ABE = Alarm in battery back up mode enable bit
AFE = Alarm flag enable
RB0 – RB2 = watchdog resolution bits
RPT1 – RPT6 = alarm repeat mode bits
BMB4
RPT5
RPT6
Rsvd
Rsvd
Rsvd
Rsvd
CB0
D6
Reserved
Alarm: day of week
10 years
Alarm 10 seconds
Alarm 10 minutes
10 seconds
10 minutes
Cal_sig
BMB3
Rsvd
Rsvd
ABE
D5
n
AI 10 date
AI 10 hour
10 hours
10 date
AI 10M
BMB2
Rsvd
10M
D4
Doc ID 17576 Rev 1
BMB1
Rsvd
D3
Hours (24 hours format)
Rsvd (bypass mode)
Calibration
Alarm seconds
BMB0
Alarm minutes
Day of month
Alarm month
D2
AIarm hour
Alarm date
Reserved
Seconds
Minutes
Month
Year
Day of week
RB1
D1
RB0
D0
Functional/range BCD format
Century/month
Calibration
Watchdog
Al month
Seconds
Minutes
AI hour
Al date
Al min
Al sec
Hours
Flags
Date
Year
Day
STLED325
0-3/01-12
00-59
00-59
00-23
01-31
00-99
01-12
01-31
00-23
00-59
00-59
01-7