M41T81 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M41T81

Serial access real-time clock with alarm

STMicroelectronics 

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Operation

M41T81

An alternate READ mode may also be implemented whereby the master reads the M41T81

slave without first writing to the (volatile) address pointer. The first address that is read is the

last one stored in the pointer (see Figure 8 on page 10).

Figure 6. Slave address location

R/W

START

SLAVE ADDRESS

A

11 01 0 0 0

Figure 7. READ mode sequence

BUS ACTIVITY:

MASTER

SDA LINE

S

WORD

ADDRESS (An)

S

BUS ACTIVITY:

SLAVE

ADDRESS

SLAVE

ADDRESS

DATA n

AI00602

DATA n+1

DATA n+X

P

Figure 8. Alternative READ mode sequence

BUS ACTIVITY:

MASTER

SDA LINE

S

BUS ACTIVITY:

SLAVE

ADDRESS

DATA n

DATA n+1

10/29

Doc ID 7529 Rev 10

AI00899

DATA n+X P

AI00895

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