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EM73201CP

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

ELAN Microelectronics 

EM73201

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

Preliminary

INTERNAL PULSE-RATE SELECTION

IPSA

00

01

10

11

Function description

XIN/210 Hz

14

XIN/2 Hz

18

XIN/2 Hz

22

XIN/2 Hz

TIMER/COUNTER FUNCTION

EVENT COUNTER MODE

For event counter mode, timer/counter increases one at any rising edge of P8.3/TRGA for timerA. When

timerA counts overflow, it will give interrupt control an interrupt request TOFIA.

P8.3/TRGA

TimerA value

n n+1

n+2

n+3 n+4 n+5

n+6

PROGRAM EXAMPLE: Enable timerA with P28.

LDIA #0100B;

OUTA P28; Enable timerA with event counter mode

TIMER MODE

For timer mode ,timer/counter increase one at any rising edge of internal pulse . User can choose 4 kinds

of internal pulse rate by setting IPSA for timerA.

When timer/counter counts overflow, TRGA will be generated to interrupt control unit.

Internal pulse

TimerA value

n n+1 n+2 n+3 n+4 n+5 n+6 n+7

PROGRAM EXAMPLE: To generate TRGA interrupt request after 60 ms with system clock XlN=4MHz

LDIA #0100B;

EXAE; enable mask 2

EICIL 110111B; interrupt latch ←0, enable EI

LDIA #06H;

STATAL;

* This specification are subject to be changed without notice.

7.20.1999 14

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