參數(shù)資料
型號: M34501M4
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 33/113頁
文件大?。?/td> 1252K
代理商: M34501M4
33
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Table 13 Change of successive comparison register AD during A-D conversion
Comparison voltage (V
ref
) value
Change of successive comparison register AD
-------------
At starting conversion
±
±
±
±
±
1: 1st comparison result
3: 3rd comparison result
9: 9th comparison result
2: 2nd comparison result
8: 8th comparison result
A: 10th comparison result
1st comparison
2nd comparison
3rd comparison
After 10th comparison
completes
1
1
1
1
0
1
2
2
0
0
1
3
0
0
0
8
0
0
0
9
0
0
0
A
A-D conversion result
V
DD
2
V
DD
2
V
DD
2
V
DD
2
V
DD
4
V
DD
4
V
DD
8
V
DD
1024
-------------
-------------
-------------
-------------
-------------
-------------
-------------
Fig. 29 Setting registers
A-D control register Q1
A
IN1
pin selected
A-D conversion mode
0
0
0
1
(Bit 3)
(Bit 0)
(7) A-D conversion timing chart
Figure 28 shows the A-D conversion timing chart.
Fig. 28 A-D conversion timing chart
(8) How to use A-D conversion
How to use A-D conversion is explained using as example in which
the analog input from P2
1
/A
IN1
pin is A-D converted, and the high-
order 4 bits of the converted data are stored in address M(Z, X, Y)
= (0, 0, 0), the middle-order 4 bits in address M(Z, X, Y) = (0, 0, 1),
and the low-order 2 bits in address M(Z, X, Y) = (0, 0, 2) of RAM.
The A-D interrupt is not used in this example.
Select the A
IN1
pin function and A-D conversion mode with the
register Q1 (refer to Figure 29).
Execute the ADST instruction and start A-D conversion.
Examine the state of ADF flag with the SNZAD instruction to de-
termine the end of A-D conversion.
Transfer the low-order 2 bits of converted data to the high-order
2 bits of register A (TALA instruction).
Transfer the contents of register A to M (Z, X, Y) = (0, 0, 2).
Transfer the high-order 8 bits of converted data to registers A
and B (TABAD instruction).
Transfer the contents of register A to M (Z, X, Y) = (0, 0, 1).
Transfer the contents of register B to register A, and then, store
into M(Z, X, Y) = (0, 0, 0).
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