STC micro STC8A8K64D4 Series - Page 575

STC8A8K64D4 Series Manual
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DIR BIT 20H.0
VALL DATA 21H
VALH DATA 22H
ORG 0000H
LJMP MAIN
ORG 00B3H
LJMP PWM0ISR
ORG 0100H
PWM0ISR:
PUSH ACC
PUSH PSW
PUSH DPL
PUSH DPH
PUSH P_SW2
MOV P_SW2,#80H
MOV A,PWMCFG
JNB ACC.3,ISREXIT
ANL PWMCFG,#NOT 08H ;Clear interrupt flag
JNB DIR,PWMDN
PWMUP:
MOV A,VALL
ADD A,#1
MOV VALL,A
MOV A,VALH
ADDC A,#0
MOV VALH,A
CJNE A,#HIGH CYCLE,SETPWM
MOV A,VALL
CJNE A,#LOW CYCLE,SETPWM
CLR DIR
JMP SETPWM
PWMDN:
MOV A,VALL
ADD A,#0FFH
MOV VALL,A
MOV A,VALH
ADDC A,#0FFH
MOV VALH,A
JNZ SETPWM
MOV A,VALL
CJNE A,#1,SETPWM
SETB DIR
SETPWM:
MOV A,VALH
MOV DPTR,#PWM0T2H
MOVX @DPTR,A
MOV A,VALL
MOV DPTR,#PWM0T2L
MOVX @DPTR,A
ISREXIT:
POP P_SW2
POP DPH
POP DPL
POP PSW
POP ACC