14

* This specification are subject to be changed without notice.

7.20.1999

EM73201

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

Preliminary

P8.3/TRGA

TimerA value

n

n+1

n+2

n+3

n+4

n+5

n+6

Internal pulse

TimerA value

n

n+1

n+2

n+3

n+4

n+5

n+6

n+7

INTERNAL PULSE-RATE SELECTION

IPSA

Function description

0 0

XIN/2

Hz

0 1

XIN/2

Hz

1 0

XIN/2

Hz

1 1

XIN/2

Hz

10

14

18

22

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.

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.

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;