here is the code again with some minor changes.

BIN_BCD: ;(Convert BIN to BCD then send BCD to BCD_ASCII)
MOV A,R0
MOV B,#100
DIV AB
MOV R3,A ; R3 CONTAIN HUNDRED NUMBER
MOV A,B
MOV B,#10
DIV AB
MOV R2,A ; R2 CONTAIN TENTH NUMBER
MOV R1,B ; R1 CONTAIN LEFT DECIMAL NUMBER
LJMP BCD_ASCII
RET


BCD_ASCII: ; (Convert BCD to ASCII)
MOV A, R0
ADD A, #30H
MOV A, R1
ADD A, #30H
MOV A, R2
ADD A, #30H
LJMP ADR_RES
RET



ADR_RES: ;(MOV each digit of time to address in RAM)
MOV A, RO
MOV A, #30h
MOV A, R1
MOV A, #31h
MOV A, R2
MOV A, #32h
RET


Any thoughts, when i enter it a simulator, it arrives with error, unknown label BIN_BCD...