PEDL66577-01

1Semiconductor

MSM66577 Family

9/34

Function

Symbol

Type

Description

V

DD

I

Power supply pin

Connect all V

GND

I

GND pin

Connect all GND pins to GND.*

V

REF

I

Analog reference voltage pin

Power

supply

AGND

I

Analog GND pin

XT0

I

Sub clock oscillation input pin

Connect to a crystal oscillator of f = 32.768 kHz.

XT1

O

Sub clock oscillation output pin

Connect to a crystal oscillator of f = 32.768 kHz.

The clock output is opposite in phase to XT0.

OSC0

I

Main clock oscillation input pin

Connect to a crystal or ceramic oscillator. Or, input an external

clock.

Oscillation

OSC1

O

Main clock oscillation output pin

Connect to a crystal or ceramic oscillator.

The clock output is opposite in phase to OSC0.

Leave this pin unconnected when an external clock is used.

Reset

RES

I

Reset input pin

NMI

I

Non-maskable interrupt input pin

EA

I

External program memory access input pin

If the

EA pin is enabled (low level), the internal program memory is

masked and the CPU executes the program code in external

program memory through all address space.

Other

SELMBUS

I

SELMBUS = H: Address/data separate bus type

SELMBUS = L: Multiplexed bus type

* Each of the family devices has unique pattern routes for the internal power and ground. Connect the

power supply voltage to all V

or more V

can not be guaranteed for normal operation.