M48T37V 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

M48T37V

5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T37Y, M48T37V

Clock operations

Table 5. Register map

Address

D7 D6 D5

Data

D4 D3 D2 D1 D0

Function/range

BCD format

7FFFh

7FFEh

7FFDh

7FFCh

7FFBh

7FFAh

7FF9h

7FF8h

7FF7h

7FF6h

7FF5h

7FF4h

7FF3h

7FF2h

7FF1h

7FF0h

10 years

Year

0

0

0 10 M

Month

0

0

10 date

Date: Day of month

0

FT

0

0

0

Day of week

0

0

10 hours

Hours

0

10 minutes

Minutes

ST

10 seconds

Seconds

W

R

S

Calibration

WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0

AFE 0

ABE

0

0

0

0

0

RPT4 0 AIarm 10 date

Alarm date

RPT3 0 AIarm 10 hours

Alarm hours

RPT2 Alarm 10 minutes

Alarm minutes

RPT1 Alarm 10 seconds

Alarm seconds

1000 year

100 year

WDF AF

Z

BL

Z

Z

Z

Z

Year

Month

Date

Day

Hours

Min

Sec

Control

Watchdog

Interrupts

Alarm date

Alarm hour

Alarm min

Alarm sec

Century

Flags

00-99

01-12

01-31

01-7

00-23

00-59

00-59

01-31

00-23

00-59

00-59

00-99

Keys:

S = Sign bit

FT = Frequency test bit

R = READ bit

W = WRITE bit

ST = Stop bit

0 = Must be set to '0'

BL = Battery low flag (read only)

BMB0-BMB4 = Watchdog multiplier bits

AFE = Alarm flag enable flag

RB0-RB1 = Watchdog resolution bits

WDS = Watchdog steering bit

ABE = Alarm in battery backup mode enable bit

RPT1-RPT4 = Alarm repeat mode bits

WDF = Watchdog flag (read only)

AF = Alarm flag (read only)

Z = '0' and are read only

Doc ID 7019 Rev 9

13/30

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