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M16C/62P Group (M16C/62P, M16C/62PT)
19. D/A Converter
This is an 8-bit, R-2R type D/A converter. These are two independent D/A converters.
D/A conversion is performed by writing to the DAi register (i = 0 to 1). To output the result of conversion, set the
DAiE bit in the DACON register to "1" (output enabled). Before D/A conversion can be used, the corresponding port
direction bit must be cleared to "0" (input mode). Setting the DAiE bit to "1" removes a pull-up from the
corresponding port.
Output analog voltage (V) is determined by a set value (n : decimal) in the DAi register.
V = VREF X n/ 256 (n = 0 to 255)
Table 19.1 lists the D/A Converter Performance. Figure 19.1 shows the D/A Converter Block Diagram. Figure 19.2
shows the D/A converter related registers. Figure 19.3 shows the D/A Converter Equivalent Circuit.
Table 19.1
D/A Converter Performance
Item
D/A Conversion Method
Resolution
Analog Output Pin
Data Bus Low-order
Figure 19.1
D/A Converter Block Diagram
Rev.2.41
Jan 10, 2006
REJ09B0185-0241
http://www.xinpian.net
VREF : reference voltage
R-2R method
8 bits
2 channels (DA0 and DA1)
DA0 Register
R-2R Resistor Ladder
DA1 Register
R-2R Resistor Ladder
Page 251 of 390
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Performance
0
DA0
1
DA0E Bit
0
DA1
1
DA1E Bit
19. D/A Converter
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