IBM nec pd78p081(a2) User Manual

Pin Name

Input/Output

Function

After Reset

Alternate Function

INTP1

Input

External interrupt request input by which the active edge

Input

P01

INTP2

(rising edge, falling edge, or both rising and falling edges)

P02

INTP3

can be specified.

P03

SI2

Input

Serial interface serial data input.

Input

P70/RxD

SO2

Output

Serial interface serial data output.

Input

P71/TxD

SCK2

Input/output

Serial interface serial clock input/output.

Input

P72/ASCK

RxD

Input

Asynchronous serial interface serial data input.

Input

P70/SI2

TxD

Output

Asynchronous serial interface serial data output.

Input

P71/SO2

ASCK

Input

Asynchronous serial interface serial clock input.

Input

P72/SCK2

TI5

Input

External count clock input to 8-bit timer (TM5).

Input

P100/TO5

TI6

External count clock input to 8-bit timer (TM6).

P101/TO6

TO5

Output

8-bit timer output. (also used for 8-bit PWM output)

Input

P100/TI5

TO6

P101/TI6

PCL

Output

Clock output. (for main system clock trimming)

Input

P35

BUZ

Output

Buzzer output.

Input

P36

ANI0-ANI7

Input

A/D converter analog input.

Input

P10-P17

AV

REF

Input

A/D converter reference voltage input.

–

–

AV

DD

–

A/D converter analog power supply.  Connected to V

DD

.

–

–

AV

SS

–

A/D converter ground potential.  Connected to V

SS

.

–

–

RESET

Input

System reset input.

–

–

X1

Input

Main system clock oscillation crystal connection.

–

–

X2

–

–

–

V

DD

–

Positive power supply.

–

–

V

PP

–

High-voltage applied during program write/verification.

–

–

Connected directly to V

SS

 in normal operating mode.

V

SS

–

Ground potential.

–

–

IC

–

Internal connection.  Connect directly to V

SS

.

–

–

NC

–

Does not internally connected.  Connect to V

SS

.

–

–

(It can be left open)

µ

Pin Name

Input/Output

Function

RESET

Input

PROM programming mode setting.

When +5 V or +12.5 V is applied to the V

PP

 pin or a low level voltage is applied to the

RESET pin, the PROM programming mode is set.

V

PP

Input

High-voltage application for PROM programming mode setting and program write/verify.

A0 to A14

Input

Address bus

D0 to D7

Input/output

Data bus

CE

Input

PROM enable input/program pulse input

OE

Input

Read strobe input to PROM

PGM

Input

Program/program inhibit input in PROM programming mode

V

DD

—

Positive power supply

V

SS

—

Ground potential