M16C1N Datasheet, PDF (141/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
15. D/A Converter
15. D/A Converter
This is an 8-bit, R-2R type D/A converter. The microcomputer contains one independent D/A converter of
this type.
D/A conversion is performed when a value is written to the corresponding D/A register. Bit 0 (D/A output
enable bit) 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. When D/A output is set for enabled, the corre-
sponding port is inhibited to be pulled up.
Output analog voltage (V) is determined by a set value (n: decimal) in the D/A register.
V = VREF X n/ 256 (n = 0 to 255)
VREF: reference voltage
Table 15.1 lists the performance of the D/A converter. Figure 15.1 shows the block diagram of the D/A
converter, Figure 15.2 shows the D/A control register and Figure 15.3 shows D/A converter equivalent
circuit.
Table 15.1 Performance of D/A converter
Item
Performance
Conversion method
R-2R method
Resolution
8 bits
Analog output pin
1 channel
D/A register (8)
R-2R resistance ladder
(Address 00D816)
D/A output enable bit
P34 / CLKS1 / DA
Figure 15.1 Block diagram of D/A converter
Rev.1.00 Oct 20, 2004 page 129 of 222
REJ09B0007-0100Z