谁能帮我看看这个语句什么意思.pic的

谁能帮我看看这个语句什么意思.pic的
INCLUDE "P16F877A.INC"
TMR0B EQU 0C3H
COUNTER EQU 20H
ORG 000H
NOP
GOTO MAIN
ORG 0004H
BCF INTCON,T0IF
DECFSZ COUNTER
GOTO RT
RLF PORTC,1
MOVLW 0AH
MOVWF COUNTER
RT MOVLW TMR0B
MOVWF TMR0
RETFIE
MAIN BSF STATUS,RP0
MOVLW 00H
MOVWF TRISC
MOVLW 07H
MOVWF OPTION_REG
BCF STATUS,RP0
MOVLW B'10100000'
MOVWF INTCON
MOVLW B'00000001'
MOVWF PORTC
MOVLW 0AH
MOVWF COUNTER
MOVLW TMR0B
MOVWF TMR0
LOOP GOTO LOOP
END