S-24CS64A Datasheet, PDF (13/44 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM

Rev.3.3_00
2-WIRE CMOS SERIAL E²PROM
S-24CS64A
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 E²PROM
receives 8-bit write data which corresponds to the page size, the page can be written.
When the E²PROM 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 E²PROM receives the upper 8 bits of
the word address and responds with an acknowledge. And the E²PROM receives the lower 8 bits of the
word address and responds with an acknowledge. After the E²PROM 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 E²PROM repeats reception of 8-bit write data and generation of
acknowledge in succession. The E²PROM 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.
SDA
LINE
S
W
T
R
A
I
R
DEVICE
T
T
ADDRESS
E
1 0 1 0 A2 A1 A0 0
UPPER WORD ADDRESS (n) LOWER WORD ADDRESS (n)
X X X W1 W1 W1 W9W8 W7 W6 W5 W4 W3 W2 W1 W0 D7
M
LRA
A
A
S
S/C
C
C
B
BW K
K
K
DATA (n)
D0
D7
A
C
K
S
T
O
DATA (n+x)
P
D0
A
C
K
Figure 13 Page Write
ADR INC
ADR INC
The lower 5 bits of the word address are automatically incremented every time when the E²PROM
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.
Seiko Instruments Inc.
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