UPD78044F datasheet(9/58 Pages) NEC

9 / 58 page

µPD78044H, 78045H, 78046H

3. PIN FUNCTIONS

3.1

PORT PINS (1/2)

Port 1

8-bit I/O port

Can be specified for input or output in 1-bit units.

When used as an input port pin, a built-in pull-up resistor can be

connected through software.Note 2

Port 2

8-bit I/O port

Can be specified for input or output in 1-bit units.

When used as an input port pin, a built-in pull-up resistor can be

connected through software.

Notes 1. When the P04/XT1 pin is used as an input port pin, bit 6 (FRC) of the processor clock control register

(PCC) must be set to 1. At this time, do not use the feedback resistor of the subsystem clock oscillator

circuit.

2. When the P10/ANI0 through P17/ANI7 pins are used as the analog input lines of the A/D converter, be

sure to place the port 1 in the input mode. In this case, the built-in pull-up resistors are automatically

unused.

P00

P01

P02

P03

P04Note 1

P10-P17

P20

P21

P22

P23

P24

P25

P26

P27

P30

P31

P32

P33

P34

P35

P36

P37

Port 0

5-bit I/O port

Input only

Can be specified for input or output in 1-

bit units. When used as an input port

pin, a built-in pull-up resistor can be

connected through software.

Input only

Function

Port 3

N-ch open-drain 8-bit I/O port

Can be specified for input or output in 1-bit units.

Can directly drive LEDs.

A built-in pull-up resistor can be connected in 1-bit units by the

mask option.

Input

I/O

Input

I/O

Shared by:

On reset

Input

INTP0/TI0

INTP1

INTP2

INTP3

XT1

ANI0-ANI7

SI1

SO1

SCK1

—

TO0

TO1

TO2

—

PCL

BUZ

—

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