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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
| Read_EEPROM:
Acall I2C_Start
Mov A,#0A0h
Acall I2C_Write
Mov A,Dph
Acall I2C_Write
Mov A,Dpl
Acall I2C_Write
Acall I2C_Start
Mov A,#0A1h
Acall I2C_Write
Acall I2C_Read
Acall I2C_Stop
Ret
Write_EEPROM:
Push Acc
Acall I2C_Start
Mov A,#0A0h
Acall I2C_Write
Mov A,Dph
Acall I2C_Write
Mov A,Dpl
Acall I2C_Write
Pop Acc
Acall I2C_Write
Acall I2C_Stop
Ret
I2C_Start:
Setb SDA
Nop
Nop
Nop
Nop
Setb SCL
Nop
Nop
Nop
Nop
Clr SDA
Nop
Nop
Nop
Nop
Clr SCL
Ret
I2C_Stop:
Clr SDA
Nop
Nop
Nop
Nop
Clr SCL
Nop
Nop
Nop
Nop
Setb SCL
Nop
Nop
Nop
Nop
Setb SDA
Ret
I2C_Write:
Mov B,#08h
I2C_Write_B:
Rlc A
Mov SDA,C
Setb SCL
Clr SCL
Setb SDA
Djnz B,I2C_Write_B
Mov C,SDA
Setb SCL
Clr SCL
Ret
I2C_Read:
Mov B,#08h
I2C_Read_B:
Mov C,SDA
Setb SCL
Mov C,SDA
Rlc A
Clr SCL
Djnz B,I2C_Read_B
Mov C,SDA
Setb SCL
Clr SCL
Ret |