D17133CS datasheet(125/289 Pages) NEC

125 / 289 page

CHAPTER 12

PORTS

110

Table 12-5. Register File Contents and Pin Functions

(n=0 to 3)

Pin Function

TMOSEL

SIOEN

P0DBIOn

RF: 12H

RF: 0AH

RF: 33H

P0D0/SCK

P0D1/SO

P0D2/SI

P0D3/TMOUT

Bit 0

Bit n

Input port

Output port

Input port

Output port

Input port

Output port

Table 12-6. Contents Read from the Port Register (0.73H)

Port Mode

Contents Read from the Port Register (0.73H)

Input port

Pin status

Output port

Output latch contents

An internal clock is selected as a serial clock.

Output latch contents

An external clock is selected as a serial clock.

Pin status

Not defined

TMOUT

Output latch contents

Caution Using the serial interface causes the output latch for the P0D1/SO pin to be affected by the

contents of the SIOSFR (shift register). So, reset the output latch before using the pin as output

port.

SCK

TMOUT

SCK

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