UPD17708 datasheet(243/356 Pages) NEC

243 / 356 page

243

µPD17704, 17705, 17707, 17708, 17709

Table 16-6. Outline of Operation in 3-Wire Serial I/O Mode

Operation Mode

3-Wire Serial I/O Mode

Slave operation (SIO0MS = 0)

Master operation (SIO0MS = 1)

Reception

Transmission

Reception

Transmission

Item

(SIO0TX = 0)

(SIO0TX = 1)

(SIO0TX = 0)

(SIO0TX = 1)

Status of

SCK0/P0A1

When P0ABIO1 = 0

Outputs internal clock regardless of P0ABIO1

each pin

Floating

Waits for input of external data

When P0ABIO1 = 1

General-purpose output port

Outputs contents of output latch

SO0/P0A0

When P0ABIO0 = 0

Outputs contents of

When P0ABIO0 = 0

Outputs contents of

General-purpose

SIO0SFR at falling

General-purpose

SIO0SFR at falling

input port

edge of external clock

input port

edge of internal

Floating

regardless of

Floating

clock regardless of

When P0ABIO0 = 1

P0ABIO0

When P0ABIO0 = 1

P0ABIO0

General-purpose

output port

Outputs contents

of output latch

SI0/P0B3

When P0BBIO3 = 0

Floating

Waits for input of external data

When P0BBIO3 = 1

General-purpose output port

Outputs contents of output latch

Clock counter

Incremented at rising of SCK0 pin

Operation of

Output

Not output

Shifted from MSB

Not output

Shifted from MSB

presettable

each time SCK0 falls

shift register 0

and is output

Input

Shifted from LSB each time SCK0 falls and is input

Wait operation

In wait

SCK0 pin is floated.

SCK0 pin outputs high

status

SO0 pin as general-

SC0 pin retains its

level

level.

purpose port.

status.

SO0 pin as general-

SO0 pin retains its

SI0 pin is floated

purpose port.

status.

SI0 pin is floated

Wait

SCK0 pin is floated

released

and waits for input of

external clock.

SO0 pin as general-

SO0 pin outputs data.

SO0 pin as general-

SO0 pin outputs data.

purpose port.

SI0 pin is floated and

purpose port.

SI0 pin is floated and

waits for input of

SI0 pin is floated and

waits for input of

external data

waits for input of

external data

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UPD17708 Datasheet(PDF) 243 Page - NEC

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