M41T66 datasheet(12/33 Pages) STMICROELECTRONICS

Part #	M41T66

Description	Serial access real-time clock with alarms

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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12 / 33 page

Operation

M41T66

12/33

2.3

WRITE mode

In this mode the master transmitter transmits to the M41T66 slave receiver. Bus protocol is

shown in Figure 10. Following the START condition 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 M41T66 slave receiver will

send an acknowledge clock to the master transmitter after it has received the slave address

see Figure 7 on page 11 and again after it has received the word address and each data

byte.

Figure 10.

WRITE mode sequence

M41T66 Datasheet(PDF) 12 Page - STMicroelectronics