S-7760A00XX-HCT1 datasheet(24/53 Pages) SII

Part #	S-7760A00XX-HCT1

Description	PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

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Manufacturer	SII [Seiko Instruments Inc]

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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

S-7760A

Rev.1.3_00

Seiko Instruments Inc.

24

6. Write operation

6. 1 Write

When this IC receives the 7-bit device address and the Read/Write instruction code “0” after receiving a start condition,

it generates an acknowledgment signal.

Next, after it receives the 8-bit word address and generates an acknowledgment signal, it receives a stop condition to

finish the Write command.

In the Write operation to the E

2PROM, the Write operation starts with a stop condition, the S-7760A finishes it after the

period to Write (max. 5 ms) has elapsed. During Write to the E

2PROM, all operations are inhibited to be performed

and the S-7760A does not send back any acknowledgment signals for command inputs.

C2 C1 C0

S

T

A

R

T

W

R

I

T

E

DEVICE

ADDRESS

R

/

W

M

S

B

SDA LINE

A

C

K

L

S

B

0

S

T

O

P

DATA

A

C

K

B7 B6 B5 B4 B3 B2 B1 B0

D

C

0

C3

D

C

1

D

C

2

Figure 27 Write

6. 2 Write Protect

Write protect is available in the S-7760A.

When the WP pin is connected to VCCH, the Write operation in all memory area is inhibited. When the WP pin is

connected to GND, Write protect becomes invalid so that the Write operation in all memory area is accepted.

Fix the WP pin during the period; from rising of SCL at installing the last bit in Write data until the completion of Write

period (max. 5 ms).

Written data in the address is not assured if the condition of the WP pin is changed during this period. Be sure to

connect the WP pin to GND when you don’t use Write Protect. Write Protect is valid in the range of power supply

voltage.

SDA

WP

SCL

Acknowledgment

signal

Period to fix WP pin

Stop

Condition

Start

Condition

Write Data

tWR

B0

Figure 28 Period to Fix WP Pin

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