Part 1
0040
0041
0042
0043
---0040
0040
0041
0042
0043
----
0002
0003
0004
0005
---0040
0040
0041
0042
0043
---0000
0000 754004
0003 754105
0006 754000
0009 754100
000C 754200
000F
0010
0012
0014
E4
F540
F541
F542
0016 754341
0019 0540
001B 1541
001D 854042
0020 AC02
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
$mod2051
;
int i,j,k
;
char c;
;
;either one of these three methods
i1
data
40h
j1
data
41h
k1
data
42h
c1
data
43h
;
dseg
org
40h
i2:
ds
1
j2:
ds
1
k2:
ds
1
c2:
ds
1
cseg
;
i3
equ
R2
j3
equ
R3
k3
equ
R4
c3
equ
R5
i3_
data
2
j3_
data
3
k3_
data
4
c3_
data
5
;-----------------------------------------;
int i,j,k;
;
char cc;
dseg
org
40h
i:
ds
1
j:
ds
1
k:
ds
1
cc:
ds
1
cseg
org
0
;-----------------------------------------;
i = 4;
;
j = 5;
;
mov
i,#4
mov
j,#5
;-----------------------------------------;
i = 0;
;
j = 0;
;
k = 0;
;
mov
i,#0
mov
j,#0
mov
k,#0
; or (better!)
clr
a
mov
i,a
mov
j,a
mov
k,a
;-----------------------------------------;
cc = 'A'
;
mov
cc,#'A'
;-----------------------------------------;
i++;
;
j--;
;
inc
i
dec
j
;-----------------------------------------;
k = i;
;
mov
k,i
mov
k3,i3_
;<-!
1
0022 E540
0024 2541
0026 F542
0028
002A
002B
002D
E540
C3
9541
F542
002F
0031
0034
0035
E540
8541F0
A4
F542
0037
0039
003C
003D
E540
8541F0
84
F542
003F
0041
0044
0045
E540
8541F0
84
85F042
0048 434320
004B 430520
004E 5343DF
0051 5305DF
0054 E540
0056 B54101
0059 00
005A
005A EA
005B B50301
005E 00
005F
005F
0061
0064
0066
0067
E540
B54102
8001
00
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
;-----------------------------------------;
k = i + j;
;
mov
a,i
add
a,j
mov
k,a
;-----------------------------------------;
k = i - j;
;
mov
a,i
clr
c
subb
a,j
mov
k,a
;-----------------------------------------;
k = i*j;
;
mov
a,i
mov
b,j
mul
ab
mov
k,a
;-----------------------------------------;
k = i/j;
;
mov
a,i
mov
b,j
div
ab
mov
k,a
;-----------------------------------------;
k = i%j;
;
mov
a,i
mov
b,j
div
ab
mov
k,b
;-----------------------------------------;
cc = cc | 0x20h /*lowercase it*/
;
orl
cc,#20h
orl
c3_,#20h
;<-!
;-----------------------------------------;
cc = cc & 0xdf /*uppercase it*/
;
anl
cc,#0dfh
anl
c3_,#0dfh
;<-!
;-----------------------------------------;
if (i==j) { ... }
;
mov
a,i
cjne
a,j,l1
nop
;...;
l1:
;
mov
a,i3
cjne
a,j3_,l1_3
;<-!
nop
;...;
l1_3:
;-----------------------------------------;
if (i!=j) {...}
;
mov
a,i
cjne
a,j,l2
sjmp
l3
l2:
nop
;...;
l3:
2
0067
0069
006C
006E
0071
0073
0074
E540
B54102
8006
B40502
8001
00
0074
0076
0079
007B
007E
007F
E540
B54102
8003
B40501
00
007F
0081
0082
0084
0086
0087
E540
C3
940A
5001
00
0087
008A
008C
008F
0091
0092
0094
0096
754000
E540
B40A02
8005
00
0540
80F4
0096
0098
009B
009D
009E
009F
00A1
7A00
BA0A02
8004
00
0A
80F7
00
---0044
0064
----
00A2
00A4
00A7
00A8
00A9
00AA
00AC
00AD
00AE
00B0
00B4
00B6
7844
9000B0
E4
93
F6
600A
08
A3
80F7
50657465
7200
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
;-----------------------------------------;
if ((i!=j) && (i!=5)) {...}
;
mov
a,i
cjne
a,j,l5
sjmp
l7
l5:
cjne
a,#5,l6
sjmp
l7
l6:
nop
;...;
l7:
;-----------------------------------------;
if ((i==j) || (i==5)) {...}
;
mov
a,i
cjne
a,j,l8
sjmp
l9
l8:
cjne
a,#5,l10
l9:
nop
;...;
l10:
;-----------------------------------------;
if (i<10) {...}
;
mov
a,i
clr
c
subb
a,#10
jnc
l11
nop
;...;
l11:
;-----------------------------------------;
for (i=0;i!=10;i++) {...}
;
mov
i,#0
l12:
mov
a,i
cjne
a,#10,l13
sjmp
l14
l13:
nop
;...;
inc
i
sjmp
l12
l14:
;
mov
i3,#0
l12_3: cjne
i3,#10,l13_3
;<-!
sjmp
l14_3
l13_3: nop
;...;
inc
i3
sjmp
l12_3
l14_3: nop
;-----------------------------------------;
char s[32],t[32];
;
dseg
s:
ds
32
t:
ds
32
cseg
;-----------------------------------------;
strcpy(s,"Peter");
;
mov
r0,#s
mov
dptr,#m1
l15:
clr
a
movc
a,@a+dptr
mov
@r0,a
jz
l16
inc
r0
inc
dptr
sjmp
l15
m1:
db
'Peter',0
204
l16:
3
00B6
00B8
00BA
00BB
00BC
00BE
00BF
00C0
00C2
7864
7944
E7
F6
6004
08
09
80F8
00C2 11C6
00C4 8005
00C6 7832
00C8 D8FE
00CA 22
00CB
00CB 7832
00CD 11D1
00CF 8003
00D1 D8FE
00D3 22
00D4
00D4
00D6
00D8
00DA
00DC
A841
A942
11DE
F540
8009
00DE
00DF
00E0
00E1
00E3
00E4
00E5
00E6
E8
C3
99
4002
E8
22
E9
22
00E7
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
;-----------------------------------------;
strcpy(t,s);
;
mov
r0,#t
mov
r1,#s
l17:
mov
a,@r1
mov
@r0,a
jz
l18
inc
r0
inc
r1
sjmp
l17
l18:
;-----------------------------------------;
delay1();
/*delay ~100 cylces*/
;
void delay1(void);
;
acall
delay1
sjmp
l19
;
delay1: mov
r0,#50
djnz
r0,$
ret
;
l19:
;-----------------------------------------; delay2(50); /*delay ~2*argument cycles*/
;
void delay2(int);
;
mov
r0,#50
acall
delay2
sjmp
l20
;
delay2: djnz
r0,$
ret
;
l20:
;-----------------------------------------;
i = max(j,k);
;
int max(int,int);
;
mov
r0,j
mov
r1,k
acall
max
mov
i,a
sjmp
l22
;
max:
mov
a,r0
clr
c
subb
a,r1
jc
l21
mov
a,r0
ret
l21:
mov
a,r1
ret
;
l22:
end
4
Part 2
----
0000
0000 11DA
0002 80FE
0004
0004
0005
0006
0007
0008
0009
0009
000A
000D
000F
0010
0013
0015
0016
0019
001B
001B
E4
FA
FB
FC
22
0C
BC640E
7C00
0B
BB3C08
7B00
0A
BA3C02
7A00
22
001C
001C
001D
001F
0021
0023
0024
0026
0028
002A
002B
002D
EA
112E
743A
119C
EB
112E
742E
119C
EC
112E
22
002E
002E
0031
0032
0034
0036
0038
003A
003C
75F00A
84
2430
119C
E5F0
2430
119C
22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
$mod2051
;-----------------------------------------; store times in binary in registers
;
mm
equ
R2
ss
equ
R3
hh
equ
R4
cseg
;-----------------------------------------; put your main function here!
; eg:
;
org
0h
;
;
;
;
; or
;
acall
mov
acall
init_lcd
a,#'A'
put_lcd
acall
polling_loop
jmp
$
;-----------------------------------------;
zero_clock();
;
zero_clock:
clr
a
mov
mm,a
mov
ss,a
mov
hh,a
ret
;-----------------------------------------;
inc_clock();
;
inc_clock:
inc
hh ;add one to the hundreds
cjne
hh,#100,inc_clock_end
mov
hh,#0
inc
ss ;add one to the seconds
cjne
ss,#60,inc_clock_end
mov
ss,#0
inc
mm
cjne
mm,#60,inc_clock_end
mov
mm,#0
inc_clock_end:
ret
;-----------------------------------------;
display_clock();
;
display_clock:
mov
a,mm
acall
put_digits
mov
a,#':'
acall
putch
mov
a,ss
acall
put_digits
mov
a,#'.'
acall
putch
mov
a,hh
acall
put_digits
ret
;
put_digits:
mov
b,#10
div
ab
add
a,#'0'
acall
putch
mov
a,b
add
a,#'0'
acall
putch
ret
5
003D
003E
0040
0042
0043
0045
0045
0047
0049
004B
004D
E6
6005
119C
08
80F8
004E
0050
0053
0055
0058
005A
005B
005C
005E
005E
0060
11B7
B40A02
80F9
B40D02
8004
F6
08
80F0
0061
0061
0064
0067
006A
006D
0070
0072
0073
0073
0074
0077
0079
0079
007B
007C
007E
0081
0083
0086
0088
008B
008D
008E
0091
0093
0094
0094
0098
740D
119C
740A
119C
22
7600
22
53890F
438920
758DFD
758BFD
759850
D28E
22
E4
900094
C2B4
C0E0
93
D2B5
1200C2
F590
1200C2
C2B5
1200C2
D0E0
04
B408E8
D2B4
22
30303038
0801060C
009C
009C 119F
009E 22
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
95
96
97
98
99
100
101
102
103
104
105
106
107
109
110
111
112
113
114
115
116
117
118
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
;-----------------------------------------;
puts(s);
; r0 points to zero terminated string
; a and r0 are altered by this routine
;
puts:
mov
a,@r0
jz
puts_end
acall
putch
inc
r0
sjmp
puts
puts_end:
mov
a,#0dh
acall
putch
mov
a,#0ah
acall
putch
ret
;-----------------------------------------;
gets(s);
; r0 points to memory to place string
; nul will be added to string
; CR will terminate string LF are ignored
; a and r0 are altered by this routine
gets:
acall
getch
cjne
a,#0ah,gets_1
sjmp
gets
gets_1: cjne
a,#0dh,gets_2
sjmp
gets_end
gets_2: mov
@r0,a
inc
r0
sjmp
gets
gets_end:
mov
@r0,#0
ret
;-----------------------------------------;
init_rs232();
init_rs232:
anl
tmod,#0fh
;zero timer 1
orl
tmod,#20h
;set mode 2
mov
th1,#0fdh
;reload value
mov
tl1,#0fdh
;initial value
mov
scon,#50h
;serial mode
setb
tr1
;start timer1
ret
;-----------------------------------------;
init_lcd();
init_lcd:
clr
a
mov
dptr,#init_table
clr
P3.4
;control not data
init_lcd_1:
push
acc
movc
a,@a+dptr
setb
P3.5
call
delay
mov
P1,a
call
delay
clr
P3.5
call
delay
pop
acc
inc
a
cjne
a,#8,init_lcd_1
setb
P3.4
;data not control
ret
init_table:
db 30h,30h,30h,38h,08h,01h,06h,0ch
140
141
142
143
144
145
146
;-----------------------------------------;
putch();
;
putch:
acall
put_rs232
;
acall
put_lcd
ret
6
009F
009F
00A1
00A4
00A6
F599
3099FD
C299
22
00A7
00A7
00A9
00AC
00AE
00B1
00B3
00B6
D2B5
1200C2
F590
1200C2
C2B5
1200C2
22
00B7
00B7 11BA
00B9 22
00BA
00BA
00BD
00BF
00C1
3098FD
C298
E599
22
00C2 7832
00C4 D8FE
00C6 22
DBFF
00C7
00C7 C28C
00C9 5389F0
00CC 438901
00CF C28D
00D1 758CDB
00D4 758AFF
00D7 D28C
00D9 22
00DA
00DA
00DC
00DE
00DE
00E1
00E3
00E5
00E7
00E9
00E9
00EC
00EE
00F0
1161
11C7
309808
11B7
111C
740D
119C
308DF2
11C7
1109
80EC
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
;-----------------------------------------;
put_rs232();
;
put_rs232:
mov
sbuf,a
jnb
ti,$
;wait for it to go
clr
ti
ret
;-----------------------------------------;
put_lcd();
;
put_lcd:
setb
P3.5
call
delay
mov
P1,a
call
delay
clr
P3.5
call
delay
ret
;-----------------------------------------;
getch();
;
getch:
acall
get_rs232
ret
;-----------------------------------------;
get_rs232();
;
get_rs232:
jnb
ri,$
clr
ri
mov
a,sbuf
ret
;-----------------------------------------;
delay(); /*~100 cycles*/
;
delay: mov
r0,#50
djnz
r0,$
ret
;-----------------------------------------;
start_timer(); /*1/100 second*/
; use timer 0
TICS
equ
0ffffh-9216
start_timer:
clr
tr0
;stop the timer
anl
tmod,#0f0h
;zero timer
orl
tmod,#01h
;set mode 1
clr
tf0
;clear flag
mov
th0,#(TICS/256)
mov
tl0,#(TICS mod 256)
setb
tr0
;start the timer
ret
;-----------------------------------------; code to increment our clock every
; 1/100 sec and check whether a character
; has arrived at the rs232 interface, ; in which case display current clock
; uses polling!
polling_loop:
acall
init_rs232
acall
start_timer
check_rs232:
jnb
ri,check_timer
acall
getch
acall
display_clock
mov
a,#0dh
;carriage return
acall
putch
check_timer:
jnb
tf0,check_rs232
acall
start_timer
acall
inc_clock
sjmp
check_rs232
;
7
Part 3
DBFF
---0040
0040
----
0000
0000 116B
000B
000B 8018
0023
0023 801C
0025
0025
0027
0029
002C
002F
0031
0034
C28C
C28D
758CDB
758AFF
D28C
12009C
32
0035
0035
0038
003A
003C
003D
003E
0040
209906
C298
A699
08
32
C299
32
0041
0041
0044
0046
0048
004A
004C
004E
004F
0051
20990B
C298
C0E0
E599
11DA
D0E0
32
C299
32
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
$mod2051
;
TICS
equ
0ffffh-9216
;-----------------------------------------; store times in binary in registers
;
mm
equ
R2
ss
equ
R3
hh
equ
R4
;
dseg
org
40h
buffer: ds
32
cseg
;-----------------------------------------; uses interrupts !
; choose which rtne you want to see working
; swap to the correct ISR as well
;
org
0h
;
acall
capture_rs232
; or perhaps
;
acall
start_timer
; or perhaps
acall
rs232_to_lcd
;
org
0bh
sjmp
clock_interrupt
org
23h
;
sjmp
capture_rs232_interrupt
; or perhaps
sjmp
rs232_to_lcd_interrupt
;-----------------------------------------; clock interrupt, start clock going for
; another 1/100 of a second
;
clock_interrupt:
clr
tr0
;stop timer
clr
tf0
;clear flag
mov
th0,#(TICS/256)
mov
tl0,#(TICS mod 256)
setb
tr0
;start the timer
call
inc_clock
reti
;-----------------------------------------; capture rs232 intrpt, put data where r0
; points, then increment r0
;
capture_rs232_interrupt:
jb
ti,l1
clr
ri
mov
@r0,sbuf
inc
r0
reti
l1:
clr
ti
reti
;-----------------------------------------; rs232 to lcd intrpt, display data on lcd
;
rs232_to_lcd_interrupt:
jb
ti,l2
clr
ri
push
acc
mov
a,sbuf
acall
put_lcd
pop
acc
reti
l2:
clr
ti
reti
8
0052
0052
0054
0057
005A
005D
0060
0063
0065
0067
0069
7840
53890F
438920
758DFD
758BFD
759850
D28E
D2AF
D2AC
80FE
006B
006B
006D
0070
0073
0076
0079
007C
007E
0080
0082
11B4
53890F
438920
758DFD
758BFD
759850
D28E
D2AF
D2AC
80FE
0084
0084
0086
0089
008C
008E
0091
0094
0096
0098
009A
C28C
5389F0
438901
C28D
758CDB
758AFF
D28C
D2AF
D2A9
80FE
009C
009C
009D
00A0
00A2
00A3
00A6
00A8
00A9
00AC
00AE
00AE
0C
BC640E
7C00
0B
BB3C08
7B00
0A
BA3C02
7A00
22
00AF 7832
00B1 D8FE
00B3 22
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
;-----------------------------------------; capture serial data - put into memory
;
capture_rs232:
mov
r0,#buffer
anl
tmod,#0fh
;zero timer 1
orl
tmod,#20h
;set mode 2
mov
th1,#0fdh
;reload value
mov
tl1,#0fdh
;initial value
mov
scon,#50h
;serial mode
setb
tr1
;start timer1
setb
ea
setb
es
sjmp
$
;-----------------------------------------; capture serial data - put to lcd
;
rs232_to_lcd:
acall
init_lcd
anl
tmod,#0fh
;zero timer 1
orl
tmod,#20h
;set mode 2
mov
th1,#0fdh
;reload value
mov
tl1,#0fdh
;initial value
mov
scon,#50h
;serial mode
setb
tr1
;start timer1
setb
ea
setb
es
sjmp
$
;-----------------------------------------;
start_timer(); /*1/100 second*/
; use timer 0
;
start_timer:
clr
tr0
;stop the timer
anl
tmod,#0f0h
;zero timer
orl
tmod,#01h
;set mode 1
clr
tf0
;clear flag
mov
th0,#(TICS/256)
mov
tl0,#(TICS mod 256)
setb
tr0
;start the timer
setb
ea
setb
et0
sjmp
$
;-----------------------------------------;
inc_clock();
inc_clock:
inc
hh ;add one to the hundreds
cjne
hh,#100,inc_clock_end
mov
hh,#0
inc
ss ;add one to the seconds
cjne
ss,#60,inc_clock_end
mov
ss,#0
inc
mm
cjne
mm,#60,inc_clock_end
mov
mm,#0
inc_clock_end:
ret
;-----------------------------------------;
delay(); /*~100 cycles*/
delay: mov
r0,#50
djnz
r0,$
ret
9
00B4
00B4
00B5
00B8
00BA
00BA
00BC
00BD
00BF
00C1
00C3
00C5
00C7
00C9
00CB
00CC
00CF
00D1
00D2
00D2
00D6
00DA
00DA
00DC
00DE
00E0
00E2
00E4
00E6
E4
9000D2
C2B4
C0E0
93
D2B5
11AF
F590
11AF
C2B5
11AF
D0E0
04
B408EB
D2B4
22
30303038
0801060C
D2B5
11AF
F590
11AF
C2B5
11AF
22
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
;-----------------------------------------;
init_lcd();
init_lcd:
clr
a
mov
dptr,#init_table
clr
P3.4
;control not data
init_lcd_1:
push
acc
movc
a,@a+dptr
setb
P3.5
call
delay
mov
P1,a
call
delay
clr
P3.5
call
delay
pop
acc
inc
a
cjne
a,#8,init_lcd_1
setb
P3.4
;data not control
ret
init_table:
db 30h,30h,30h,38h,08h,01h,06h,0ch
155
156
157
158
159
160
161
162
163
164
165
;-----------------------------------------;
put_lcd();
put_lcd:
setb
P3.5
call
delay
mov
P1,a
call
delay
clr
P3.5
call
delay
ret
end
10