EM73C63 datasheet(14/40 Pages) EMC

14 / 40 page

* This specification are subject to be changed without notice.

8.11.2000

EM73C63

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

SYSTEM CLOCK MODE CONTROL

The system clock mode controller can start or stop the high-frequency and low-frequency clock oscillator

and switch between the basic clocks. EM73C63 has four operation modes (DUAL, SLOW,IDLE and

STOP operation modes).

Operation Mode

Oscillator

System Clock

Available function

One instruction cycle

DUAL

High, Low frequency

High frequency clock

LCD, sound generator

8 / fc

SLOW

Low frequency

Low frequency clock

LCD

8 / fs

IDLE

Low frequency

CPU stops

LCD

STOP

None

CPU stops

All disable

DUAL OPERATION MODE

The 4-bit µc is in the DUAL operation mode when the CPU is reseted. This mode is dual clock system

(high-frequency and low-frequency clocks oscillating). It can be changed to SLOW or STOP operation

mode with the command register (P22 or P16).

LCD display and sound generator are available for the DUAL operation mode.

SLOW OPERATION MODE

The SLOW operation mode is single clock system (low-frequency clock oscillating). It can be changed to

the DUAL operation mode with the command register (P22), STOP operation mode with P16 and IDEL

operation mode with P19.

LCD display and sound generator are available for the SLOW operation mode.

STOP

operation

mode

DUAL

operation

mode

IDLE

(CPU

stops)

SLOW

operation

mode

RESET

operation

High osc : stopped

Low osc : stopped

High osc : stopped

Low osc : oscillating

High osc : oscillating

Low osc : oscillating

High osc : stopped

Low osc : oscillating

Command

(P16)

Command

(P16)

Command

(P22)

Command

(P22)

Command

(P19)

Reset

Reset release

I/O wakeup

I/O or internal timer wakeup

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