MB88141

8

2.

For D/A Converter

+ I/O Expander Operation (MOD = “H”)

(2) Slave Address Comparison (7 bits)

Slave address comparison is the same as for D/A converter (12-channel) operation (see “1. (2) “Slave Address

Comparison”), with the exception that the CS2 setting determines the number of D/A converter channels and

the number of I/O expander bits.

(3) R/W Selection (1 bit)

CS2

D/A converter

I/O expander

0

4 channels (AO1 to AO4)

8 bits (D7 to D0)

1

8 channels (AO1 to AO8)

4 bits (D3 to D0)

R/W

I/O expander operation

D/A converter operation

→ parallel data output

→ analog output

1

Parallel data input



First

S6

S0 R/W

D7

D0

Last

Last

D0

D7

C0

C7

R/W

S0

S6

First

S

S0

1

A

A

A

A

A

P

P

Slave address (7 bits)

Digital data (8 bits)

Slave address (7 bits)

Channel selection (8 bits)

Digital data (8 bits)

: Sent from master device

: Sent from MB88141 (slave device)

S: “Start” condition

P: “Stop” condition

A: “Acknowledge” output