用51单片机进行pwm实现(具有发送端和接收端)答:PWM_LOW:MOV A,#0FFH MOVX @DPTR,A ;输出低脉宽 INC R7 CJNE R7,#0FFH,PWM_LOW ;达到255,即满一周期,返回 POP ACC RET or ORG OOOOH MOV A,#00H WW: MOV P0,A INC A LCALL DELAY CJNE A,#0FFH,WW WW1: DEC A MOV P0,A LCALL DELAY CJNE A,#00H,WW1 SJMP WW DELAY: MOV...