MSM66P507 データシートの表示（PDF） - Oki Electric Industry

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MSM66P507

OLMS-66K Series 16-Bit Microcontroller

Oki Electric Industry 

¡ Semiconductor

MSM66507/66P507

PIN DESCRIPTION (Continued)

Symbol

ALE

PSEN

OE

Type

O

O

I

Description

Timing pulse output pin to latch the lower 8 bits of the address output from port

0 when the CPU accesses the external memory

Strobe pulse output pin to fetch to external program memory

Normally, when P0, P1, and P7.4-P7.7 are in an output state and the OE pin is

"H" level, the ports go to a high impedance state. When OE pin is "L" level,

the ports output "H" or "L" level. However, when P0, P1, and P7.4-P7.7 are in

an input state, these ports are not under the influence of OE pin.

NMI

I

Nonmaskable interrupt request input pin

RES

RESET input pin

I

Low-active reset input pin

EA

Normally set to "H" level. If set to "L" level, the program memory goes to external

I

access mode and accesses external program memory.

VDD

I

Power supply pin

GND

I

Ground pin

6/24

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