counter.lst

DW8051 Verilog VHDL 源码和文档

AVRASM ver. 1.30  COUNTER.ASM Sun Jul 07 15:58:37 2002


         ; This program is for simulation purpose
         ; It demo how the MCU output 3, 2 and 1 to each port (Port B, Port C and Port D)
         ; There are 3 approaches used in accomplishing the above task
         
          .include "riscmcu.inc"
         
         ;***** I/O Register Definitions
         
          .equ	SREG	=$3f
          .equ	GIMSK	=$3b
          .equ	TIMSK	=$39
          .equ	TIFR	=$38
          .equ	MCUCR	=$35
          .equ	TCCR0	=$33
          .equ	TCNT0	=$32
         
          .equ	PORTB	=$18
          .equ	DDRB	=$17
          .equ	PINB	=$16
          .equ	PORTC	=$15
          .equ	DDRC	=$14
          .equ	PINC	=$13
          .equ	PORTD	=$12
          .equ	DDRD	=$11
          .equ	PIND	=$10
         
         
         ;***** Bit Definitions
         
          .equ	INT0	=6
         
          .equ	TOIE0	=1
         
          .equ	TOV0	=1
         
          .equ	ISC01	=1
          .equ	ISC00	=0
         
          .equ	CS02	=2
          .equ	CS01	=1
          .equ	CS00	=0
         
          .def	ZP 	=r30
         
         
          .def	B = r16
          .def	C = r17
          .def	D = r18
          .def	TEMP = r19
         
         
         
000000 c002      	rjmp	reset		; reset vector
000001 9508      	ret			; external interrupt vertor(not use)
000002 9508      	ret			; timer overflow interrupt vertor (not use)
         
         
          reset:
000003 2733      	clr	TEMP		; r19 = 00
000004 9530      	com	TEMP		; r19 = FF
000005 bb37      	out	DDRB,TEMP	; set all Port B pins as output
000006 bb34      	out	DDRC,TEMP	; set all Port C pins as output
000007 bb31      	out	DDRD,TEMP	; set all Port D pins as output
         
         
         
         ; Approach 1, output to Port B
         
000008 e003      	ldi	B,3		; r16 = 03
000009 bb08      again1:	out	PORTB,B		; Port B now output 03
00000a 950a      	dec	B		; r16 = r16 - 1
00000b 3000      	cpi	B,0		; if r16 = 0,
00000c f7e1      	brne	again1		;   branch to again1
         				
         
         
         ; Approach 2, output to Port C
         
00000d 2733      	clr	TEMP		; r19 = 00
00000e 9513      	inc	C		; r17 = 01
00000f 9513      	inc	C		; r17 = 02
000010 9513      	inc	C		; r17 = 03
000011 bb15      again2:	out	PORTC,C		; Port C now output 03
000012 5011      	subi	C,1		; r17 = r17 - 1
000013 1313      	cpse	C,TEMP		; if r17 != r19 (means if r17 != 0),
000014 cffc      	rjmp	again2		;    branch to again2
         				
         
         
         ; Approach 3, output to Port D
         
000015 2722      	clr	D		; r18 = 00
000016 5f2d      	subi	D,-3		; r18 = r18 - (-3) = 03
000017 bb22      again3:	out	PORTD,D		; Port D now output 03
000018 952a      	dec	D		; r18 = r18 -1
000019 b73f      	in	TEMP,SREG	; transfer the value of SR to R19
00001a ff31      	sbrs	TEMP,1		; if bit 1 in R19 (the Z-flag) is set, skip the next instruction
00001b cffb      	rjmp	again3		;    else branch to again3
         				
         
         
00001c cfff      end:	rjmp	end		; Branch Forever
00001d 9478      	sei			; (Set I-Bit in SR) This 2 instructions won't execute 
00001e 9468      	set			; (Set T-Bit in SR)   even they are fetched to the IR
         	
         
         
         

Assembly complete with no errors.