Port 0 - NEC 78K0 User Manual

8-bit single-chip microcontrollers

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Port 0

Port 0 is a 7-bit I/O port with an output latch. Port 0 can be set to the input mode or output mode in 1-bit units

using port mode register 0 (PM0). When the P00 to P06 pins are used as an input port, use of an on-chip pull-up

resistor can be specified by pull-up resistor option register 0 (PU0).

This port can also be used for timer I/O, serial interface data I/O, and clock I/O.

RESET input sets port 0 to input mode.

Figures 4-2 to 4-5 show block diagrams of port 0.

Caution When P02/SO11

write to serial clock selection register 11 (CSIC11).

PU00, PU03, PU05

Alternate function

Output latch

(P00, P03, P05)

PM00, PM03, PM05

Note Available only in the

Pull-up resistor option register 0

PM0: Port mode register 0

WR××: Write signal

CHAPTER 4 PORT FUNCTIONS

, and P04/SCK11

Figure 4-2. Block Diagram of P00, P03, and P05

PD780146, 780148, and 78F0148.

User's Manual U15947EJ2V0UD

are used as general-purpose ports, do not

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