FOR AUTOMOTIVE 105

°C OPERATION 2-WIRE SERIAL E

S-24CS01A/02A/04A H Series

13

6. 2 Page write

The page write mode allows up to 8 bytes to be written in a single write operation in the S-24CS01A/02A and 16 bytes

to be written in a single write operation in the S-24CS04A.

Basic data transmission procedure is the same as that in the "Byte Write". But instead of generating a stop condition,

the master transmits 8-bit write data up to 8 bytes before the page write.

When the S-24CS01A/02A/04A 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 S-24CS01A/02A/04A receives an 8-bit word

address, and responds with an acknowledge. After the S-24CS01A/02A/04A 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 S-24CS01A/02A/04A repeats reception of 8-bit write data and generation of acknowledge in

succession. The S-24CS01A/02A/04A 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.

Remark1. A0 is P0 in the S-24CS04A.

2. W7 is optional in the S-24CS01A.

S

T

A

R

T

1

0

1

0

W

R

I

T

E

S

T

O

P

DEVICE

ADDRESS

WORD ADDRESS (n)

R

/

W

M

S

B

SDA

LINE

A2 A1 A0

A

C

K

L

S

B

A

C

K

A

C

K

0

D7 D6 D5 D4 D3 D2 D1 D0

D7

D7

D0

A

C

K

ADR INC

ADR INC

A

C

K

DATA (n)

DATA (n+1)

DATA (n+x)

W7 W6 W5 W4 W3 W2 W1 W0

ADR INC

D0

Figure 13 Page Write

In S-24CS01A/02A, the lower 3 bits of the word address are automatically incremented every time when the

S-24CS01A/02A receives 8-bit write data. If the size of the write data exceeds 8 bytes, the upper 5 bits of the word

address remain unchanged, and the lower 3 bits are rolled over and previously received data will be overwritten.

In S-24CS04A, the lower 4 bits of the word address are automatically incremented every time when the S-24CS04A

receives 8-bit write data. If the size of the write data exceeds 16 bytes, the upper 4 bits of the word address and page

address (P0) remain unchanged, and the lower 4 bits are rolled over and previously received data will be overwritten.