Holtek HT-IDE, User Manual

Page: 196 / 258

Program
#include ht48c10.inc
;------------------------------------------------------------
data .section ’data’ ;== data section ==
count1 db ? ;delay loop counter 1
count2 db ? ;delay loop counter 2
lamp db ? ;lamp register
;------------------------------------------------------------
code .section at 0 ’code’ ; == program section ==
org 00H ;
jmp start ;
org 04h ;external interrupt subroutine
reti ;for guarantee
org 08h ;timer/event 0 interrupt subroutine
reti ;for guarantee
org 0ch ;timer/event 1 interrupt subroutine
reti ;for guarantee
start: ;
clr intc ;initialize registers
clr tmrc ;to guarantee performance
clr tmr ;(interrupts)
set pac ;(ports)
set pbc ;(input mode)
set pcc ;
main:
mov a,0 ;(1) ;
mov pac,a ;set port A to output port
mov pa,a ;zero port A (all lamp on)
mov a,0feh ;(2) ;1111 1110 (1:OFF ,0:ON)
mov lamp,a ;set initial lamp state
llamp: ;shift lamp left loop
mov a,lamp ;load lamp state
mov pa,a ;output lamp state to port A
HT-IDE User’s Guide
186