UPD17708 datasheet(255/358 Pages) RENESAS

255 / 358 page

253

µPD17704, 17705, 17707, 17708, 17709

16.3.8 Operation mode and operation of each part

Tables 16-9 outlines the operations of the 3-wire serial I/O mode.

Table 16-9. Outline of Operation of Serial Interface 1

Operation Mode

3-Wire Serial I/O Mode

Slave operation

Master operation

Item

(SIO1CK1 = SIO1CK0 = 0)

(SIO1CK1 = SIO1CK0 = other than 0)

Status of

P0B2/SCK1

During wait

Wait released

During wait

Wait released

each pin

(SIO1TS = 0)

(SIO1TS = 1)

(SIO1TS = 0)

(SIO1TS = 1)

When P0BBIO2 = 0

Floating

General-purpose

Waits for input of

General-purpose

input port

external clock

input port

When P0BBIO2 = 1

General-purpose

Outputs internal clock

output port

Outputs contents of

Outputs contents

Outputs high level

output latch

of output latch

P0B1/SO1

SIO1HIZ = 0

SIO1HIZ = 1

SIO1HIZ = 0

SIO1HIZ = 1

When P0BBIO1 = 0

Floating

General-purpose

input port

When P0BBIO1 = 1

General-purpose

Outputs data

General-purpose

Outputs data

output port

Outputs contents of

output latch

P0B0/SI1

When P0BBIO0 = 0

Floating

Waits for input of serial data

When P0BBIO0 = 1

General-purpose output port

Outputs contents of output latch

Clock counter

Incremented at rising of SCK1 pin

Operation of

Output

SIO1HIZ = 0

presettable

Not output

shift register 1

SIO1HIZ = 1

Shifted from MSB each time SCK1 pin falls and is output

Input

Shifted from LSB each time SCK1 pin rises and is input.

SI1 pin outputs contents of output latch when P0BBIO0 = 1

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