S-7760A53XX-HCT1 datasheet(23/53 Pages) SII

Part #	S-7760A53XX-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)

Rev.1.3_00

S-7760A

Seiko Instruments Inc.

23

4. Acknowledgment

Data is transmitted sequentially in 8-bit. Changing the SDA line to “L” indicates that the devices on the system bus

have received data, thus the devices send an acknowledgment signal back during the 9th clock of cycle.

The S-7760A does not send an acknowledgment signal back during the Write operation.

1

8

9

Acknowledgment

signal output

Start

Condition

SCL

Input

SDA

(Master device

’s

output)

SDA

Output

Figure 25 Acknowledgment Output Timing

5. Read operation

When this IC receives the 7-bit device address and the Read/Write instruction code “1” after receiving a start condition,

it generates an acknowledgment signal.

Next, data with 8-bit length is output from this IC synchronizing with the SCL clock.

After that, the master device sends a stop condition, not an acknowledgment signal in order to finish the Read

operation.

S

T

A

R

T

R

E

A

D

S

T

O

P

DEVICE

ADDRESS

R

/

W

M

S

B

SDA LINE

C2 C1 C0

B7 B6 B5 B4 B3 B2 B1 B0

A

C

K

L

S

B

1

DATA

NO ACK from

Master Device

D

C

0

C3

D

C

1

D

C

2

Figure 26 Read

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S-7760A53XX-HCT1 Datasheet(PDF) 23 Page - Seiko Instruments Inc

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