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EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

Random generator

f(x)=x9+x4+1

EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

+

12 3 4 5 6 7 8 9

Volume control register (P17)

The are 16 levels of volume for sound generator. P17 is the volume control register.

Port17

Initial value : 1111

32 1 0

VCR

VCR

ts/tp

1 11 1

15/16

ts

1 11 0

:

0 00 1

14/16

:

1/16

1

tp= CLK/64 (CLK=4.6MHz)

tp

0 00 0

0/16

PROGRAM EXAMPLE:

LDIA

#1001B

OUTA

P30

LDIA

#0111B

OUTA

P17

LDIA

#0011B

OUTA

P24

LDIA

#0001B

OUTA

P23

; basic frequency : CLK/32, tone output

; volume control

; 1430 Hz tone output

WATCH-DOG-TIMER (WDT)

Watch-dog-timer can help user to detect the malfunction (runaway) of CPU and give system a timeup signal every

certain time . User can use the time up signal to give system a reset signal when system is fail.

This function is available by mask option. If the mask option of WDT is enabled, it will stop counting when CPU

is reseted or in the STOP operation mode.

The basic structure of Watch-Dog-Timer control is composed by a 4-stage binary counter and a control unit .

The WDT counter counts for a certain time to check the CPU status, if there is no malfunction happened, the

counter will be cleared and continue counting . Otherwise, if there is a malfunction happened, the WDT control

will send a WDT signal ( low active ) to reset CPU. The WDT checking period is assign by P21 ( WDT command

port ).

LXIN/213

WDT counter

01 2 3

counter clear request WDT control

RESET pin

mask option

P21

WDT

command port

* This specification are subject to be changed without notice.

10.31.2000 26

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