HT56R64 Datasheet, PDF (36/90 Pages) Holtek Semiconductor Inc – TinyPower A/D Type with LCD 8-Bit OTP MCU

HT56R64
Timer Program Example
This program example shows how the Timer/Event Counter registers are setup, along with how the interrupts are en-
abled and managed. Note how the Timer/Event Counter is turned on, by setting bit 4 of the Timer Control Register. The
Timer/Event Counter can be turned off in a similar way by clearing the same bit. This example program sets the
Timer/Event Counter to be in the timer mode, which uses the internal system clock as the clock source.
org 04h
; external interrupt vector
reti
org 08h
; Timer/Event Counter 0 interrupt vector
jmp tmrint
; jump here when the Timer/Event Counter 0 overflows
:
org 20h
; main program
;internal Timer/Event Counter 0 interrupt routine
tmrint:
:
; Timer/Event Counter 0 main program placed here
:
reti
:
:
begin:
;setup Timer 0 registers
mov a,09bh
; setup Timer 0 preload value
mov tmr0,a;
mov a,081h
; setup Timer 0 control register
mov tmr0c,a
; timer mode and prescaler set to /2
; setup interrupt register
mov a,009h
; enable master interrupt and timer interrupt
mov int0c,a
set tmr0c.4
; start Timer/Event Counter 0 - note mode bits must be previously setup
Rev. 1.40
36
September 8, 2009