HT47C20 datasheet(21/46 Pages) HOLTEK

21 / 46 page

HT47C20

Rev. 1.60

July 26, 2002

Example for RC type AD converter mode (Timer A overflow):

clr tmrc

clr adcr.1

; set timer mode

clr intc1.4

; clear timer/event counter interrupt request flag

mov a, low (65536-1000)

; give timer A initial value

mov tmrbl, a

; count 1000 time and then overflow

mov a, high (65536-1000)

mov tmrbh, a

mov a, 00010010b

; RS0~CS0; set RC type ADC mode; set Timer A overflow

mov adcr,a

mov a, 00h

; give timer B initial value

mov tmrbl, a

mov a, 00h

mov tmrbh, a

mov a, 00110000b

; timer A clock source=T1 and timer on

mov tmrc, a

p10:

clr wdt

snz intcl.4

; polling timer/event counter interrupt request flag

jmp p10

clr intcl.4

; clear timer/event counter interrupt request flag

; program continue

Example for RC type AD converter mode (Timer B overflow):

clr tmrc

clr adcr.1

; set timer mode

clr intc1.4

; clear timer/event counter interrupt request flag

mov a, 00h

; give timer A initial value

mov tmrbl, a

mov a, 00h

mov tmrbh, a

mov a, 00010011b

; RS0~CS0; set RC type ADC mode; set Timer B overflow

mov adcr,a

mov a, low (65536-1000)

; give timer B initial value

mov tmrbl, a

; count 1000 time and then overflow

mov a, high (65536-1000)

mov tmrbh, a

mov a, 00110000b

; timer A clock source=T1 and timer on

mov tmrc, a

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