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HT47C20 Folha de dados(PDF) 23 Page - Holtek Semiconductor Inc

Nome de Peças HT47C20
Descrição Electrónicos  8-Bit Microcontroller
PDF  56 Pages
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT47C20 Folha de dados(HTML) 23 Page - Holtek Semiconductor Inc

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HT47C20
23
January 18, 2000
It is strongly recommended to load first the de-
sired value for TMRBL, TMRBH, TMRAL, and
TMRAH registers, before turning on the re-
lated timer/event counter for proper operation.
Because the initial value of TMRBL, TMRBH,
TMRAL and TMRAH are unknown.
If the timer/event counter is on, the TMRAH,
TMRAL, TMRBH and TMRBL cannot be read
or written to. Only when the timer/event coun-
ter is off and when the instruction ²MOV² is
used could those four registers be read or writ-
ten to.
Example for Timer/event counter mode (disable interrupt):
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 initial value
mov tmrbl, a
; count 1000 time and then overflow
mov a, high (65536-1000)
mov tmrbh, a
mov a, 00110000b
; timer 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 contimue



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