M30622 Mitsubishi, M30622 Datasheet - Page 157

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M30622

Manufacturer Part Number
M30622
Description
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Manufacturer
Mitsubishi
Datasheet

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D-A Converter
D-A Converter
Table 1.21.1. Performance of D-A converter
Figure 1.21.1. Block diagram of D-A converter
This is an 8-bit, R-2R type D-A converter. The microcomputer contains two independent D-A converters of
this type.
D-A conversion is performed when a value is written to the corresponding D-A register. Bits 0 and 1 (D-A
output enable bits) of the D-A control register decide if the result of conversion is to be output. Do not set the
target port to output mode if D-A conversion is to be performed.
Output analog voltage (V) is determined by a set value (n : decimal) in the D-A register.
Table 1.21.1 lists the performance of the D-A converter. Figure 1.21.1 shows the block diagram of the D-A
converter. Figure 1.21.2 shows the D-A control register. Figure 1.21.3 shows the D-A converter equivalent
circuit.
Conversion method
Resolution
Analog output pin
Tentative Specifications REV.A
S
pecifications in this manual are tentative and subject to change.
Item
Data bus low-order bits
V = V
R-2R resistor ladder
R-2R resistor ladder
D-A register0 (8)
D-A register1 (8)
REF
R-2R method
8 bits
2 channels
X n/ 256 (n = 0 to 255)
V
REF
: reference voltage
157
D-A0 output enable bit
D-A1 output enable bit
(Address 03D8
(Address 03DA
Performance
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
P9
P9
16
16
3
4
)
)
/DA
/DA
0
1
Mitsubishi microcomputers
M16C / 62T Group

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