NEC PD78078 User Manual

µ

V

PP

—

—

—

Pin Name

Input/Output

Function

After Reset Alternate Function

AD0 to AD7

Input/Output

Low-order address/data bus when expanding external memory

Input

P40 to P47

A0 to A7

Output

Low-order address bus when expanding external memory

Input

P80 to P87

A8 to A15

Output

High-order address bus when expanding external memory

Input

P50 to P57

RD

Strobe signal output for read operation from external memory

P64

WR

Strobe signal output for write operation to external memory

P65

WAIT

Input

Wait insertion when accessing external memory

Input

P66

Strobe output externally latching address information output to ports 4,

5 to access external memory

ANI0 to ANI7

Input

A/D converter analog input

Input

P10 to P17

ANO0, ANO1

Output

D/A converter analog output

Input

P130, P131

AV

REF0

Input

A/D converter reference voltage input

—

—

AV

REF1

Input

D/A converter reference voltage input

—

—

AV

DD

—

A/D converter analog power supply.  Connect to V

DD

.

—

—

AV

SS

—

A/D converter, D/A converter ground potential.  Connect to V

SS

.

—

—

RESET

Input

System reset input

—

—

X1

Input

—

—

X2

—

—

—

XT1

Input

Input

P07

XT2

—

—

—

V

DD

—

Positive power supply

—

—

High-voltage application for program write/verify.  Connect directly to

V

SS

 in normal operating mode.

V

SS

—

Ground potential

—

—

IC

—

Internally connected.  Connect directly to V

SS.

—

—

µ

Pin Name

Input/Output

Function

PROM programming mode setting.

RESET

Input

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 A16

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

Output

Input

ASTB

Output

Input

P67

Crystal connection for main system clock oscillation

Crystal connection for subsystem clock oscillation