M41T80 datasheet(11/20 Pages) STMICROELECTRONICS

No. de pieza	M41T80

Descripción Electrónicos	SERIAL ACCESS RTC WITH ALARMS

PDF	20 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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M41T80

Figure 11. Alternative READ Mode Sequence

WRITE Mode

In this mode the master transmitter transmits to

the M41T80 slave receiver. Bus protocol is shown

in Figure 12, page 11. Following the START con-

dition and slave address, a logic '0' (R/W=0) is

placed on the bus and indicates to the addressed

device that word address “An” will follow and is to

be written to the on-chip address pointer. The data

word to be written to the memory is strobed in next

and the internal address pointer is incremented to

the next address location on the reception of an

acknowledge clock. The M41T80 slave receiver

will send an acknowledge clock to the master

transmitter after it has received the slave address

see Figure 9, page 10 and again after it has re-

ceived the word address and each data byte.

Figure 12. WRITE Mode Sequence

AI00895

BUS ACTIVITY:

SDA LINE

BUS ACTIVITY:

MASTER

DATA n

DATA n+1

DATA n+X

SLAVE

ADDRESS

AI00591

BUS ACTIVITY:

SDA LINE

BUS ACTIVITY:

MASTER

DATA n

DATA n+1

DATA n+X

WORD

ADDRESS (An)

SLAVE

ADDRESS

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