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参数资料
| 型号： | M38203E4-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 65/69页 |
| 文件大小： | 944K |
| 代理商： | M38203E4-XXXFP |
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Rev.4.01
Nov 14, 2003
page 68 of 136
3803/3804 Group
D-A CONVERTER
The 3803/3804 group has two internal D-A converters (DA1 and
DA2) with 8-bit resolution.
The D-A conversion is performed by setting the value in each D-A
conversion register. The result of D-A conversion is output from
the DA1 or DA2 pin by setting the DA output enable bit to “1”.
When using the D-A converter, the corresponding port direction
register bit (P30/DA1 or P31/DA2) must be set to “0” (input status).
The output analog voltage V is determined by the value n (decimal
notation) in the D-A conversion register as follows:
V = VREF n/256 (n = 0 to 255)
Where VREF is the reference voltage.
At reset, the D-A conversion registers are cleared to “0016”, and
the DA output enable bits are cleared to “0”, and the P30/DA1 and
P31/DA2 pins become high impedance.
The DA output does not have buffers. Accordingly, connect an ex-
ternal buffer when driving a low-impedance load.
Fig. 60 Block diagram of D-A converter
Fig. 61 Equivalent connection circuit of D-A converter (DA1)
P30/DA1
D-A1 conversion register (8)
R-2R resistor ladder
DA1 output enable bit
P31/DA2
D-A2 conversion register (8)
R-2R resistor ladder
DA2 output enable bit
D
a
ta
b
u
s
AVSS
VREF
“0”
“1”
MSB
“0”
“1”
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R2R
LSB
2R
P30/DA1
D-A1 conversion register
DA1 output enable bit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M38203M4 | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38203M4-065FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| M38203M4-076FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| M38203M4-083FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| M38203M4-093FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
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