53单片机PWM输出汇编源码 INDF EQU 00H TMR0 EQU 01H PCL EQU 02H STATUS EQU 03H FSR EQU 04H PORTA EQU 05H PORTB EQU 06H GeneralPurposeRegister EQU 07H PCON EQU 08H WUCON EQU 09H PCHBUF EQU 0AH PDCON EQU 0BH ODCON EQU 0CH PHCON EQU 0DH INTEN EQU 0EH INTFLAG EQU 0FH