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参数资料
| 型号： | M37274MA-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PDIP52 |
| 封装： | 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-52 |
| 文件页数： | 57/131页 |
| 文件大小： | 2049K |
| 代理商： | M37274MA-XXXSP |
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31
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice:
This
is not
a final
specification.
Some
paramentic
limits
are
subject
to change.
MITSUBISHI MICROCOMPUTERS
VREF
256
! (n – 0.5)
1 to 255
0
Note: VREF indicates the voltage of internal VCC.
Fig. 23. Changes in A-D Conversion Register and Comparison Voltage during A-D Conversion
(6) Conversion Method
Set bit 7 of the interrupt input polarity register (address 021216) to
“1” to generate an interrupt request at completion of A-D conver-
sion.
Set the A-D conversion INT3 interrupt request bit to “0” (even
when A-D conversion is started, the A-D conversion INT3 inter-
rupt reguest bit is not set to “0” automatically).
When using A-D conversion interrupt, enable interrupts by setting
A-D conversion INT3 interrupt request bit to “1” and setting the
interrupt disable flag to “0.”
Set the VCC connection selection bit to “1” to connect VCC 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
INT3 interrupt reguest bit, or the occurrence of an A-D conversion
interrupt.
Read the A-D conversion register to obtain the conversion results.
Note : When the ladder resistor is disconnect from VCC, set the VCC
connection selection bit to “0” between steps 7and 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 “0016.”
The most significant bit of the A-D conversion register becomes
“1, ” and the comparison voltage “Vref” is input to the comparator.
At this point, Vref is compared with the analog input voltage “VIN .”
Bit 7 is determined by the comparison results as follows.
When Vref < VIN : bit 7 holds “1”
When Vref > VIN : bit 7 becomes “0”
With the above operations, the analog value is converted into a digi-
tal value. The A-D conversion terminates in a maximum of 50 ma-
chine cycles (12.5 s at f(XIN) = 8 MHz) after it starts, and the con-
version 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 INT3 interrupt request
bit becomes “1.” The A-D conversion completion bit also becomes
“1.”
Table 3. Expression for Vref and VREF
A-D conversion register contents “n”
(decimal notation)
Vref (V)
12 3 45 6 7 8
1 00 0 0 0 0 0
12
10 0
0 0 0
10 0 0 0 0
0
1
12 3 4 5 6 7
1
VREF
2
VREF
512
–
VREF
2
VREF
4
VREF
512
–
±
VREF
2
VREF
4
VREF
8
VREF
512
–
±
00 0 0 0
00 0
Contents of A-D conversion register
Reference voltage (Vref)
[V]
0
A-D conversion start
1st comparison start
3rd comparison start
8th comparison start
2nd comparison start
Digital value corresponding to
analog input voltage.
A-D conversion completion
(8th comparison completion)
VREF
2
VREF
4
VREF
8
±
VREF
512
–
VREF
256
±
.......
: Value determined by mth (m = 1 to 8) result
m
.....
±
0
1
2
3
4
5
6
7
8
1
2
3
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