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參數(shù)資料
| 型號： | M37224M3-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-42 |
| 文件頁數(shù)： | 26/83頁 |
| 文件大?。?/td> | 901K |
| 代理商： | M37224M3-XXXSP |
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M37224M3-XXXSP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
32
D-A CONVERTER
The M37224M3-XXXSP has 2 D-A converters with 6-bit resolution.
D-A converter block diagram is shown in Figure 30.
D-A conversion is performed by setting the value in the DA conver-
sion register. The result of D-A conversion is output from the DA pin
by setting “1” to the DA output enable bit of the port P3 output mode
control register (bits 2 and 3 at address 00CD16).
The output analog voltage V is determined with the value n (n: deci-
mal number) in the DA conversion register.
V = VCC !
(n = 0 to 127)
The DA output does not build in a buffer, so connect an external
buffer when driving a low-impedance load.
n
128
D-A Conversion Register
Table 4. Relation between Contents of D-A Conversion Register and
Output Voltage
Bit 7
0
1
0
1
0
1
000/128 VCC
001/128 VCC
002/128 VCC
125/128 VCC
126/128 VCC
127/128 VCC
Output
Voltage “V”
…
Bit 5
0
1
…
Bit 4
0
1
…
Bit 3
0
1
…
Bit 2
0
1
…
Bit 1
0
1
…
Bit 0
0
1
0
1
…
Fig. 30. D-A Converter Block Diagram
Data bus
DA1 output enable bit
Resistor ladder
DA1 conversion register
DA1
(address 00DE16)
7
DA2
7
Resistor ladder
DA2 conversion register
(address 00DF16)
DA2 output enable bit
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