UPD17708 datasheet(242/356 Pages) NEC

242 / 356 page

242

µPD17704, 17705, 17707, 17708, 17709

Table 16-5. Outline of Operation in 2-Wire Serial I/O Mode

Operation Mode

2-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

SDA/P0A3

When P0ABIO3 = 0

Outputs contents of

When P0ABIO3 = 0

Outputs contents of

each pin

Floating

SIO0SFR at falling of

Floating

SIO0SFR at falling of

Waits for input of

external clock

Waits for input of

internal clock

external data

regardless of P0ABIO3

external data

regardless of P0ABIO3

When P0ABIO3 = 1

General-purpose

output port

Outputs contents

Outputs contents of

of output latch

output latch

SCL/P0A2

When P0ABIO2 = 0

Outputs internal clock regardless of P0ABIO2

Floating

Waits for input of external data

When P0ABIO2 = 1

General-purpose output port

Outputs contents of output latch

Clock counter

Incremented at rising of SCL pin

Operation of

Output

Not output

Shifted from MSB

Not output

Shifted from MSB

presettable

each time SCL falls

shift register 0

and is output

Input

Shifted from LSB each time SCL rise and is input

Wait operation

In wait

SCL and SDA pins

SCL pin is floated

SCL pin outputs high

status

are floated

and SDA pin retains

level and SDA pin is

level and SDA pin

its status

floated

retains its status

Wait

SCL pin is floated

SCL pin outputs

released

and waits for input of

and waits for input

internal clock.

external clock.

of external clock.

SDA pin is floated and

SDA pin outputs data

SDA pin is floated and

SDA pin outputs data

waits for external data

each time SCL pin falls

waits for external data

each time SCL pin falls

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