M16C62P_06 Datasheet, PDF (266/421 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

M16C/62P Group (M16C/62P, M16C/62PT)
19. D/A Converter
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)
VREF : reference voltage
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
Performance
D/A Conversion Method
R-2R method
Resolution
8 bits
Analog Output Pin
2 channels (DA0 and DA1)
Data Bus Low-order
DA0 Register
0
R-2R Resistor Ladder
DA0
1
DA0E Bit
DA1 Register
R-2R Resistor Ladder
0
DA1
1
DA1E Bit
Figure 19.1 D/A Converter Block Diagram
Rev.2.41 Jan 10, 2006 Page 251 of 390
REJ09B0185-0241