S-24CS64A datasheet(13/44 Pages) SII

13 / 44 page

2-WIRE CMOS SERIAL E2PROM

Rev.3.3_00

S-24CS64A

Seiko Instruments Inc.

6.2 Page Write

The page write mode allows up to 32 bytes to be written in a single wire operation in the S-24CS64A.

Basic data transmission procedure is the same as that in the “Byte Write”. However, when the E

2PROM

receives 8-bit write data which corresponds to the page size, the page can be written.

When the E

2PROM receives a 7-bit device address and a 1-bit read / write instruction code set to “0”,

following a start condition, it generates an acknowledge. Then the E

2PROM receives the upper 8 bits of

the word address and responds with an acknowledge. And the E

2PROM receives the lower 8 bits of the

word address and responds with an acknowledge. After the E

2PROM receives 8-bit write data and

responds with an acknowledge, it receives 8-bit write data corresponding to the next word address, and

generates an acknowledge. The E

2PROM repeats reception of 8-bit write data and generation of

acknowledge in succession. The E

2PROM can receive as many write data as the maximum page size.

Receiving a stop condition initiates a write cycle of the area starting from the designated memory address

and having the page size equal to the received write data.

DEVICE

ADDRESS

LOWER WORD ADDRESS (n)

UPPER WORD ADDRESS (n)

SDA

LINE

A2 A1 A0

X W1

ADR INC

DATA (n)

DATA (n+x)

W1 W1 W9

W5 W4 W3 W2 W1 W0

Figure 13 Page Write

The lower 5 bits of the word address are automatically incremented every time when the E

2PROM

receives 8-bit write data. If the size of the write data exceeds 32 bytes, the upper 8 bits of the word

address remain unchanged, and the lower 5 bits are rolled over and previously received data will be

overwritten.

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