D-A Converter - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

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, 1). To output the result of conversion, set
the DACON register's DAiE bit to "1" (output enabled). Before D-A conversion can be used, the corresponding
port direction bit must be set 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.
Table 1.17.1 lists the performance of the D-A converter. Figure 1.17.1 shows the block diagram of the D-A
converter. Figure 1.17.2 shows the D-A converter-related registers. Figure 1.17.3 shows the D-A converter
equivalent circuit.
Table 1.17.1 D-A Converter Performance
Item
D-A conversion method
Resolution
Analog output pin
Figure 1.17.1 D-A Converter Block Diagram
Rev.1.00 2003.05.30 page 198
✕ n/ 256 (n = 0 to 255)
V = V
REF
V : reference voltage
REF
R-2R method
8 bits
2 (DA0 and DA1)
Data bus low-order
DA0 register
R-2R ladder resistor
DA1 register
R-2R ladder resistor
Performance
DA
0
DA0E bit
DA
1
DA1E bit
D-A Converter