appendk.txt

很少见的源码公开的msc51和z80的c编译器。















                                   APPENDIX K

                                AS8051 ASSEMBLER





        K.1  8051 REGISTER SET 

        The following is a list of the 8051 registers used by AS8051:  

                a,b             -       8-bit accumulators
                r0,r1,r2,r3     -       8-bit registers
                r4,r5,r6,r7
                dptr            -       data pointer
                sp              -       stack pointer
                pc		-	program counter
                psw             -       status word
                c		-	carry (bit in status word)


        K.2  8051 INSTRUCTION SET 


           The  following tables list all 8051 mnemonics recognized
        by the AS8051  assembler.   The  following  list  specifies  the
        format for each addressing mode supported by AS8051:  

                #data           immediate data
                                byte or word data
        
                r,r1,r2         register r0,r1,r2,r3,r4,r5,r6, or r7
        
                @r              indirect on register r0 or r1
                @dptr           indirect on data pointer
                @a+dptr		indirect on accumulator plus data pointer
                @a+pc           indirect on accumulator plus program counter
                
                addr            direct memory address

                bitaddr         bit address
        
                label           call or jump label

        The terms data, addr, bitaddr, and label may all be expressions.  

           Note  that  not all addressing modes are valid with every in-
        struction.  Refer to  the  8051  technical  data  for  valid
        modes.  


        K.2.1  Inherent Instructions 

                nop


        K.2.6  Move Instructions 

                mov     a,#data		mov	a,addr
                mov	a,r		mov	a,@r

                mov     r,#data		mov	r,addr
                mov	r,a

                mov     addr,a		mov	addr,#data
                mov	addr,r		mov	addr,@r
                mov	addr1,addr2	mov	bitaddr,c
        
                mov     @r,#data	mov	@r,addr
                mov	@r,a

                mov	c,bitaddr
                mov	dptr,#data

                movc    a,@a+dptr	movc    a,@a+pc
                movx    a,@dptr		movx	a,@r
                movx	@dptr,a		movx	@r,a


        K.2.8  Single Operand Instructions

		clr	a		clr	c	
                clr	bitaddr
		cpl	a		cpl	c	
                cpl	bitaddr
                setb	c		setb	bitaddr

                da	a		
                rr	a		rrc	a
                rl	a		rlc	a
                swap	a

		dec	a		dec	r	
                dec	@r
		inc	a		inc	r	
                inc	dptr		inc	@r

		div	ab		mul	ab

                pop	addr		push	addr


        K.2.8  Two Operand Instructions

		add	a,#data		add	a,addr	
		add	a,r		add	a,@r
		addc	a,#data		addc	a,addr	
		addc	a,r		addc	a,@r
		subb	a,#data		subb	a,addr	
		subb	a,r		subb	a,@r
		orl	a,#data		orl	a,addr	
		orl	a,r		orl	a,@r
		orl	addr,a		orl	addr,#data
		orl	c,bitaddr	orl	c,/bitaddr
                anl     a,#data         anl     a,addr
                anl     a,r             anl     a,@r
                anl     addr,a          anl     addr,#data
                anl     c,bitaddr       anl     c,/bitaddr
                xrl     a,#data         xrl     a,addr
                xrl     a,r             xrl     a,@r
                xrl     addr,a          xrl     addr,#data
                xrl     c,bitaddr       xrl     c,/bitaddr
		xch	a,addr		xch	a,r	
		xch	a,@r		xchd	a,@r


        K.2.3  Call and Return Instructions 

                acall   label		lcall   label
                ret             	reti

        K.2.4  Jump Instructions 

                ajmp    label
                cjne    a,#data,label	cjne    a,addr,label
                cjne    r,#data,label	cjne    @r,#data,label
                djnz    r,label		djnz    addr,label
                jbc     bitadr,label
                jb      bitadr,label	jnb     bitadr,label
                jc      label		jnc     label
                jz      label		jnz     label
                jmp	@a+dptr
                ljmp    label		sjmp    label