PD780133 datasheet(41/558 Pages) NEC

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CHAPTER 2 PIN FUNCTIONS

User’s Manual U16228EJ2V0UD

2.2.2 P10 to P17 (port 1)

P10 to P17 function as an 8-bit I/O port. These pins also function as pins for external interrupt request input, serial

interface data I/O, clock I/O, and timer I/O.

The following operation modes can be specified in 1-bit units.

(1) Port mode

P10 to P17 function as an 8-bit I/O port. P10 to P17 can be set to input or output in 1-bit units using port mode

(2) Control mode

P10 to P17 function as external interrupt request input, serial interface data I/O, clock I/O, and timer I/O.

(a) SI10

This is a serial interface serial data input pin.

(b) SO10

This is a serial interface serial data output pin.

This is a serial interface serial clock I/O pin.

(d) RxD0, RxD6

These are the serial data input pins of the asynchronous serial interface.

(e) TxD0, TxD6

These are the serial data output pins of the asynchronous serial interface.

(f)

TI50

This is the pin for inputting an external count clock to 8-bit timer/event counter 50.

(g) TO50, TOH0, and TOH1

These are timer output pins.

(h) INTP5

This is an external interrupt request input pin for which the valid edge (rising edge, falling edge, or both rising

and falling edges) can be specified.

2.2.3 P20 to P27 (port 2)

P20 to P27 function as an 8-bit input-only port. These pins also function as pins for A/D converter analog input.

The following operation modes can be specified in 1-bit units.

(1) Port mode

P20 to P27 function as an 8-bit input-only port.

(2) Control mode

P20 to P27 function as A/D converter analog input pins (ANI0 to ANI7). When using these pins as analog input

pins, see (5) ANI0/P20 to ANI7/P27 in 12.6 Cautions for A/D Converter.

PD780133 Datasheet(PDF) 41 Page - NEC