HT83F40P datasheet(22/61 Pages) HOLTEK

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HT83FXX

Rev. 1.00

May 12, 2009

Timer Program Example

The following example program section is based on the HT83F60 device, which contain two 8-bit timers. Programming

the timer for other devices is conducted in a very similar way. The program shows how the timer registers are setup

along with how the interrupts are enabled and managed. Points to note in the example are how, for the 8-bit timer. Note

how the timer is turned on by setting bit 4 of the respective timer control register. The timer can be turned off in a similar

way by clearing the same bit. This example program sets the timer to be in the timer mode which uses the internal fsys

as their clock source, and produce a timer 0 interrupt per 1ms.

#include HT83F60.inc

jmp

begin

org 04h

; time base vector

reti

org 08h

; timer 0 interrupt vector

jmp tmr0int

; jump here when timer 0 overflows every 1ms

org 0Ch

reti

org 10h

reti

org 14h

reti

; internal timer 0 interrupt routine

Tmr0int:

; timer 0 main program placed here

reti

begin:

; setup timer 0 registers

mov

a,06h

; setup timer 0 low byte

mov

tmr0,a

; flow byte must be setup before high byte

mov

a,094

; setup timer 0 control register

mov

tmr0c,a

; setup timer mode and clock source is fsys/32 prescaler

; setup interrupt register

mov

a,05h

; enable global interrupt

mov

intc,a

; enable timer 0 interrupt

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