STFPC320 查看數據表（PDF） - STMicroelectronics

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STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

Real-time clock (RTC) operation

STFPC320

6.5

Register table for RTC

Table 4. Register table for RTC

Addr D7

D6

D5

D4

D3

D2 D1 D0 Function/range BCD format

00h

Reserved

Reserved

-

-

01h ST

10 seconds

Seconds

Seconds

00-59

02h OFIE

10 minutes

Minutes

Minutes

00-59

03h

0

0

10 hours

Hours (24-hour format)

Hours

00-23

04h RS3 RS2 RS1 RS0

0

Day of week

Day

01-7

05h

1

0

10 date

Date: day of month

Date

01-31

06h CB0 CB1

0

10M

Month

Century/month 0-3/01-12

07h

10 Years

Year

Year

00-99

08h

1

0

S

Calibration

Calibration

09h RB2 BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0

Watchdog

0Ah AFE SQWE

1

Al 10M

Alarm month

Al month

01-12

0Bh RPT4 RPT5

Al 10 date

Alarm date

Al date

01-31

0Ch RPT3

0

Al 10 Hour

Alarm Hour

Al hour

00-23

0Dh RPT2

Alarm 10 minutes

Alarm minutes

Al min

00-59

0Eh RPT1

Alarm 10 seconds

Alarm seconds

Al sec

00-59

0Fh WDF AF

0

0

0

Flags

Keys: S = sign bit

ST = stop bit

OFIE = oscillator fail interrupt enable bit

BMB0 – BMB4 = watchdog multiplier bits

CEB = century enable bit

CB = century bit

OUT = output level

SQWE = square wave enable bit

AFE = Alarm flag enable flag

RS0-RS3 = SQW frequency bits

RB0 – RB2 = watchdog resolution bits

RPT1 – RPT5 = alarm repeat mode bits

WDF = watchdog flag (read only)

AF = alarm flag (read only)

OF = Oscillator fail bit

It is recommended to fill the unused bits in the register map to ‘0’ upon a cold boot up.

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