S-24CM01C

13

6. 2 Page write

The page write mode allows up to 256 bytes to be written in a single write operation in the S-24CM01C.

The basic process used to transmit data is the same as byte write, but page write involves sequentially receiving

as much 8-bit write data as the size of the page.

When the S-24CM01C 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. The S-24CM01C then receives the upper 8-bit word address, and

responds with an acknowledge. The S-24CM01C then receives the lower 8-bit word address, and responds with

an acknowledge. After the S-24CM01C 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-24CM01C repeats

reception of 8-bit write data and generation of acknowledges in succession. The S-24CM01C can receive as

much 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

with a page size equal to the received write data.

A2 A1 P0

S

T

A

R

T

1 0 1 0

W

R

I

T

E

DEVICE

ADDRESS

UPPER

WORD ADDRESS (n)

R

/

W

M

S

B

SDA LINE

A

C

K

L

S

B

LOWER

WORD ADDRESS (n)

0

W15

W7 W6 W5 W4 W3 W2 W1 W0

DATA (n)

D7

D0

S

T

O

P

W12 W11 W10 W9 W8

A

C

K

W13

A

C

K

DATA (n+x)

D7

D0

W14

Figure 12 Page Write

In the S-24CM01C, the lower 8 bits of the word address are automatically incremented every time the

S-24CM01C receives 8-bit write data. If the size of the write data exceeds 256 bytes, the upper 8 bits of the word

address and the page address (P0) remain unchanged, and the lower 8 bits are rolled over so that the last

256-byte data that the S-24CM01C received is overwritten.