EM73P968 datasheet(22/53 Pages) EMC

22 / 53 page

* This specification are subject to be changed without notice.

8.14.2001

EM73P968

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminar

TIMER/COUNTER CONTROL

P8.1/TRGB, P8.3/TRGA are the external timer inputs for timerB and timerA, they are used in event

counter and pulse-width measurement mode.

Timer/counter command port: P28 is the command port for timer/counterA and P29 is for the timer/

counterB.

P28, P29 3210

Initial value : 0000

TMSA(B) IPSA(B)

TMSA(B) Mode selection

0 0

Stop

0 1

Event counter mode

1 0

Timer mode

1 1

Pulse width measurement mode

IPSA

Clock rate selection

IPSB

Clock rate selection

NORMAL mode SLOW mode

0 0

LXIN/23 HZ

Reserved

0 0

Depend on high speed timer/counter

0 1

LXIN/27 HZ

0 1

LXIN/25 HZ

1 0

LXIN/211 HZ

1 0

LXIN/29 HZ

1 1

LXIN/215 HZ

1 1

LXIN/213 HZ

TIMER/COUNTER FUNCTION

Timer/counterA,B are programmable for timer, event counter and pulse width measurement mode. Each

timer/counter can execute any of these functions independently.

EVENT COUNTER MODE

Under event counter mode, the timer/counter is increased by one at any rising edge of P8.1/TRGB for timerB

(P8.3/TRGA for timer A). When timerB (timerA) counts overflow, it will provide an interrupt request

TRGB (TRGA) to interrupt control unit.

PROGRAM EXAMPLE: Enable timerA with P28

LDIA

#0100b;

OUTA

P28

; Enable timerA with event counter mode

P8.1/TRGB (P8.3/TRGA)

TimerB (TimerA) value n

n+1

n+2

n+3

n+4

n+5

n+6

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