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[/] [RISCMCU/] [trunk/] [asm/] [counter.lst] - Blame information for rev 25

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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.

Line No.	Rev	Author	Line
1	25	yapzihe
2			`AVRASM ver. 1.30 COUNTER.ASM Sun Jul 07 15:58:37 2002`
3
4
5			`; This program is for simulation purpose`
6			`; It demo how the MCU output 3, 2 and 1 to each port (Port B, Port C and Port D)`
7			`; There are 3 approaches used in accomplishing the above task`
8
9			`.include "riscmcu.inc"`
10
11			`;***** I/O Register Definitions`
12
13			`.equ SREG =$3f`
14			`.equ GIMSK =$3b`
15			`.equ TIMSK =$39`
16			`.equ TIFR =$38`
17			`.equ MCUCR =$35`
18			`.equ TCCR0 =$33`
19			`.equ TCNT0 =$32`
20
21			`.equ PORTB =$18`
22			`.equ DDRB =$17`
23			`.equ PINB =$16`
24			`.equ PORTC =$15`
25			`.equ DDRC =$14`
26			`.equ PINC =$13`
27			`.equ PORTD =$12`
28			`.equ DDRD =$11`
29			`.equ PIND =$10`
30
31
32			`;***** Bit Definitions`
33
34			`.equ INT0 =6`
35
36			`.equ TOIE0 =1`
37
38			`.equ TOV0 =1`
39
40			`.equ ISC01 =1`
41			`.equ ISC00 =0`
42
43			`.equ CS02 =2`
44			`.equ CS01 =1`
45			`.equ CS00 =0`
46
47			`.def ZP =r30`
48
49
50			`.def B = r16`
51			`.def C = r17`
52			`.def D = r18`
53			`.def TEMP = r19`
54
55
56
57			`000000 c002 rjmp reset ; reset vector`
58			`000001 9508 ret ; external interrupt vertor(not use)`
59			`000002 9508 ret ; timer overflow interrupt vertor (not use)`
60
61
62			`reset:`
63			`000003 2733 clr TEMP ; r19 = 00`
64			`000004 9530 com TEMP ; r19 = FF`
65			`000005 bb37 out DDRB,TEMP ; set all Port B pins as output`
66			`000006 bb34 out DDRC,TEMP ; set all Port C pins as output`
67			`000007 bb31 out DDRD,TEMP ; set all Port D pins as output`
68
69
70
71			`; Approach 1, output to Port B`
72
73			`000008 e003 ldi B,3 ; r16 = 03`
74			`000009 bb08 again1: out PORTB,B ; Port B now output 03`
75			`00000a 950a dec B ; r16 = r16 - 1`
76			`00000b 3000 cpi B,0 ; if r16 = 0,`
77			`00000c f7e1 brne again1 ; branch to again1`
78
79
80
81			`; Approach 2, output to Port C`
82
83			`00000d 2733 clr TEMP ; r19 = 00`
84			`00000e 9513 inc C ; r17 = 01`
85			`00000f 9513 inc C ; r17 = 02`
86			`000010 9513 inc C ; r17 = 03`
87			`000011 bb15 again2: out PORTC,C ; Port C now output 03`
88			`000012 5011 subi C,1 ; r17 = r17 - 1`
89			`000013 1313 cpse C,TEMP ; if r17 != r19 (means if r17 != 0),`
90			`000014 cffc rjmp again2 ; branch to again2`
91
92
93
94			`; Approach 3, output to Port D`
95
96			`000015 2722 clr D ; r18 = 00`
97			`000016 5f2d subi D,-3 ; r18 = r18 - (-3) = 03`
98			`000017 bb22 again3: out PORTD,D ; Port D now output 03`
99			`000018 952a dec D ; r18 = r18 -1`
100			`000019 b73f in TEMP,SREG ; transfer the value of SR to R19`
101			`00001a ff31 sbrs TEMP,1 ; if bit 1 in R19 (the Z-flag) is set, skip the next instruction`
102			`00001b cffb rjmp again3 ; else branch to again3`
103
104
105
106			`00001c cfff end: rjmp end ; Branch Forever`
107			`00001d 9478 sei ; (Set I-Bit in SR) This 2 instructions won't execute`
108			`00001e 9468 set ; (Set T-Bit in SR) even they are fetched to the IR`
109
110
111
112
113
114			`Assembly complete with no errors.`

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[/] [RISCMCU/] [trunk/] [asm/] [counter.lst] - Blame information for rev 25