UPD78044F datasheet(39/472 Pages) NEC

39 / 472 page

Chapter 2

Pin Function (µPD780828A Subseries)

User’s Manual U16504EE1V1UD00

2.3 Description of Pin Functions

2.3.1 P00 to P03 (Port 0)

This is an 4-bit input/output port.

Besides serving as input/output port the external interrupt input is

implemented.

(1)

Port mode

P00 to P03 function as input/output ports. P00 to P03 can be specified for input or output bit-wise

with a port mode register. When they are used as input ports, pull-up resistors can be connected

to them by defining the pull-up resistor option register.

(2)

Control mode

In this mode this port operates as external interrupt input.

(a) INTP0 to INTP2

INTP0 to INTP2 are external input pins which can specify valid edges (rising, falling or rising

and falling) of this external interrupt pins.

(b) CCLK

CCLK is the input pin for an external CAN clock.

2.3.2 P10 to P14 (Port 1)

These pins constitute a 5-bit input only port. In addition, they are also used to input A/D converter ana-

log signals. The following operating modes can be specified bit-wise.

(1)

Port mode

In this mode, P10 to P14 function as a 5-bit input only port.

(2)

Control mode

In this mode, P10 to P14 function as A/D converter analog input pins (ANI0 to ANI4).

2.3.3 P20 to P27 (Port 2)

These pins constitute an 8-bit output only port. In addition they are also used as PWM output pins to

control meters.

(1)

Port mode

In this mode, P20 to P27 function as an 8-bit output only port.

(2)

Control mode

In this mode, P20 to P27 function as PWM output pins (SM11 to SM14 and SM21 to SM24) for

meter control.

UPD78044F Datasheet(PDF) 39 Page - NEC