Zliczanie impulsów w układzie MCS-51: Jak podzielić licznik T1 przez 16 i sprawdzić count?

Mon Mar 15, 2004 8:49 am   

Witam, z pomoca grupowiczów i literatury MCS-51 udało mi sie dojść do
nastepujących wniosków:
aby zliczyc impulsy w zadanej jednostce czasu nalezy:
Zakladam ze mam kwarc 12Mhz co daje 1.000.000 cykli na sekunde a wiec
uzywajac T0 w trybie timera 16 bitowego przerwanie wystapi raz na 65535
cykli czyli okolo 15 razy na sekunde. T1 natomiast ustawiony jest w tryb
counter i do niego podawane sa impulsy z zewnatrz. I teraz przy kazdym
przerwaniu bede zwiekszal sobie zmienna count o 1 i w petli programu
odczytywal jej wartosc, jesli wyniesie 15 odczytam stan licznika T1.
Zastanawiam sie nad jednym
stan licznika T1 zapisany jest w TH1 i TL1 musze wynik ten podzielic przez
16 jak to zrobic ? oraz jak przeczytac czy count ma 15 ? CJNE ?


COUNT EQU 0
intcw EQU 15
mov A,#intcw

SJMP PROG

PRZE:
INC COUNT
RETI

PROG:
MOV TMOD,#%01010101
MOV TCON,#%01010000
SETB IE.7 ;przerwania
SETB IE.1 ;przerwanie od T0

LICZ:
JB TF0,PRZE
CJNE A,#COUNT,LICZ
;TUTAJ ODCZYT STANU TH0 i TL0 gdy liczba przerwan 15

Oczywiscie kod nie jest moze kompletny ale chodzi mi o ogolny zarys.

M.

Mon Mar 15, 2004 2:47 pm   

http://groups.go
ogle.pl/groups?hl=pl&inlang=pl&lr=&ie=ISO-8859-2&q=dzielenie++51
http://groups.go
ogle.pl/groups?hl=pl&inlang=pl&lr=&ie=ISO-8859-2&q=dzielenie++16+bitowych

np. CJNE, albo

mov a,count
XRL a,#15
jz .........

Pozdrawiam
Darek

Tue Mar 16, 2004 12:33 am   

Dzieki ze zabrales glos w moim watku
"Predator" <energetykaNospam@op.pl> wrote in message
news:<c33jsl$c4l$1@news.onet.pl>...

mov a,count
XRL a,#15
jz .........
Spowoduje ze gdy A i #15 będą takie same do A wpisane zostanie 0 i JZ gdy A
0 skoczy do podanej etykiety?

Czyli stan licznika zapisany w TH1 i TL1 mogę sprawdzic w:
MOV A,TH1
ORL A,TL0 ;akumulator zawiera teraz stan licznika T1 zsumowane TH1 i TL1 ?
MOV B,#16
DIV AB ;A zawiera teraz wynik z dzielenia ilosci impulsow zliczonych (T1/16)
tylko czesci calkowite ?

M.

Wed Oct 18, 2006 12:01 pm   

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