參數(shù)資料
型號(hào)： M37225M6
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits Microcomputer(8位單片機(jī))
中文描述： 單芯片8位單片機(jī)（8位單片機(jī)）
文件頁數(shù)： 51/133頁
文件大?。?/td> 1610K
代理商： M37225M6
51
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37225M6–XXXSP, M37225M8–XXXSP
M37225ECSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Note:
V
REF
indicates the reference voltage (= Vcc).
Fig. 8.8.3 Changes in A-D Conversion Register and Comparison Voltage during A-D Conversion
8.8.6 Conversion Method
Set the A-D conversion interrupt request bit to “0” (even when A-
D conversion is started, the A-D conversion interrupt reguest bit
is not set to “0” automatically).
When using A-D conversion interrupt, enable interrupts by setting
A-D conversion interrupt enable bit to “1” and setting the interrupt
disable flag to “0.”
Set the V
CC
connection selection bit to “1” to connect V
CC
to the
resistor ladder.
√
Select analog input pins by the analog input selection bit of the
A-D control register.
Set the A-D conversion completion bit to “0.” This write operation
starts the A-D conversion. Do not read the A-D conversion regis-
ter during the A-D conversion.
≈
Verify the completion of the conversion by the state (“1”) of the
A-D conversion completion bit, the state (“1”) of A-D conversion
interrupt reguest bit, or the occurrence of an A-D conversion in-
terrupt.
Read the A-D conversion register to obtain the conversion re-
sults.
Note :
When the ladder resistor is disconnect from V
CC
, set the V
CC
connec-
tion selection bit to “0” between steps
≈
and
.
8.8.7 Internal Operation
When the A-D conversion starts, the following operations are auto-
matically performed.
The A-D conversion register is set to “00
16
.”
The most significant bit of the A-D conversion register becomes
“1, ” and the comparison voltage “V
ref
” is input to the comparator. At
this point, V
ref
is compared with the analog input voltage “V
IN
.”
Bit 7 is determined by the comparison results as follows.
When V
ref
< V
IN
: bit 7 holds “1”
When V
ref
> V
IN
: bit 7 becomes “0”
With the above operations, the analog value is converted into a digital
value. The A-D conversion terminates in a maximum of 50 machine
cycles (8.5
μ
s at f(X
IN
) = 8 MHz) after it starts, and the conversion
result is stored in the A-D conversion register.
An A-D conversion interrupt request occurs at the same time as A-D
conversion completion, the A-D conversion interrupt request bit be-
comes “1.” The A-D conversion completion bit also becomes “1.”
Table 8.8.1 Expression for V
ref
and V
REF
A-D conversion register contents “n”
(decimal notation)
0
1 to 255
Vref (V)
0
V
REF
2
V
REF
2
V
REF
2
V
REF
512
V
REF
4
V
REF
4
V
REF
512
V
REF
8
V
REF
512
V
REF
2
V
REF
4
V
REF
8
V
REF
256
V
REF
512
1 2
3 4 5 6
Digital value corresponding to
analog input voltage.
7 8
1 0 0 0 0
0 0
0
1 2
1 0 0
0 0
0
1 0 0 0
0 0
0
1
1 2
3 4 5
6
7
1
–
–
±
–
±
±
0 0 0 0 0
0 0 0
Contents of A-D conversion register
Reference voltage (V
ref
)
[V]
0
A-D conversion start
1st comparison start
3rd comparison start
8th comparison start
2nd comparison start
A-D conversion completion
(8th comparison completion)
±
±
±
–
±
.......
: Value determined by mth (m = 1 to 8) result
m
.....
V
REF
256
~
(n
|
0.5)
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