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            CSEG

            ORG         0000H                   ; power on/reset vector
            jmp         on_reset

            ORG         0003H                   ; external interrupt 0 vector
            reti                                ; undefined

            ORG         000BH                   ; timer 0 overflow vector
            reti                                ; undefined

            ORG         0013H                   ; external interrupt 1 vector
            reti                                ; undefined

            ORG         001BH                   ; timer 1 overflow vector
            JMP         TIMER1_ISR

            ORG         0023H                   ; serial I/O interrupt vector
            reti                                ; undefined

;***********************************************************************************
;系統(tǒng)初始化等
            ORG         0033H                   ; begin code space
            USING       0                       ; register bank zero
on_reset:
            MOV         R7,#00H
            DJNZ        R7,$        ;延時
            MOV         sp, #(stack-1)          ; initialize stack pointer

            ;禁止各中斷
            MOV         IE,#00H
            MOV         IP,#00H
SYS_INIT:
            MOV         R0,#00H
SYS_INIT_LOOP:
            MOV         R1,#00H
            DJNZ        R1,$
            DJNZ        R0,SYS_INIT_LOOP        ;延時0.13S

            ;內(nèi)部RAM(30H-5fH)清零
            MOV         R1,#30H
            MOV         A,#0
ZERO_LOOP:  MOV         @R1,A
            INC         R1
            CJNE        R1,#60H,ZERO_LOOP

            ;定時器1初始化
            MOV         TMOD,#00010000B         ;方式1，16位定時器模式

            MOV         PWM_HIGH_L,#LOW(65536 - cycle_high)
            MOV         PWM_HIGH_H,#HIGH(65536 - cycle_high)

            MOV         PWM_LOW_L,#LOW(65536 - (cycle - cycle_high))
            MOV         PWM_LOW_H,#HIGH(65536 - (cycle - cycle_high))

            SETB        P_PWM1                  ;先輸出高
            MOV         TL1,PWM_HIGH_L
            MOV         TH1,PWM_HIGH_H

            SETB        ET1                     ;T1開中斷
            SETB        EA                      ;開總中斷
            SETB        TR1                     ;開定時器1

MAIN_LOOP:
;主循環(huán)
            SJMP        $

;**********************************************************************
;**********************************************************************
;定時器1中斷服務(wù)程序
TIMER1_ISR:
            USING       1                       ; register bank 1
            PUSH        ACC
            PUSH        PSW

            JB          P_PWM1,PWM_OUT_LOW      ;如果輸出為高則，輸出低
            SETB        P_PWM1
            MOV         TL1,PWM_HIGH_L
            MOV         TH1,PWM_HIGH_H
            JMP         TIMER_ISR_RET

PWM_OUT_LOW:
            CLR         P_PWM1
            MOV         TL1,PWM_LOW_L
            MOV         TH1,PWM_LOW_H

TIMER_ISR_RET:
            POP         PSW
            POP         ACC
            RETI
;*********************************************************************
;
            END