EM73880 datasheet(13/40 Pages) EMC

13 / 40 page

* This specification are subject to be changed without notice.

EM73880

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

11.30.2001

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. EM73880 has four operation modes (NORMAL, SLOW,IDLE and

STOP operation modes).

Operation Mode

Oscillator

System Clock

Available function

Operation Mode

Oscillator

System Clock

Available function

Operation Mode

Oscillator

System Clock

Available function

Operation Mode

Oscillator

System Clock

Available function

Operation Mode

Oscillator

System Clock

Available function

One instruction cycle

NORMAL

High, Low frequency

High frequency clock

LCD, HST, Speech sound

8 / fc

SLOW

Low frequency

Low frequency clock

LCD, HST

8 / fs

IDLE

Low frequency

CPU stops

LCD

STOP

None

CPU stops

All disable

STOP

operation

mode

NORMAL

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

High-frequency

generator

System clock

mode control

System control

Crystal connection

LXIN

LXOUT

P14

P16

P22

P19

Low-frequency

generator

Mask option for choose Crystal or RC oscillator

LXIN

LXOUT

CLK

open

LXIN

LXOUT

VDD

RC oscillator connection

R=1.2M

Ω

0.022uF

20PF

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