M306H2MC-XXXFP Datasheet, PDF (143/210 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306H2MC-XXXFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA ACQUISITION CONTROLLER
2.13 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.
V = VREF X n/ 256 (n = 0 to 255)
VREF : reference voltage
Table 2.13.1 lists the performance of the D-A converter. Figure 2.13.1 shows the block diagram of the
D-A converter. Figure 2.13.2 shows the D-A control register. Figure 2.13.3 shows the D-A converter
equivalent circuit.
Table 2.13.1 Performance of D-A converter
Item
Conversion method
R-2R method
Performance
Resolution
Analog output pin
8 bits
2 channels
Data bus low-order bits
D-A register0 (8)
(Address 03D816)
R-2R resistor ladder
D-A0 output enable bit
P93/DA0
D-A register1 (8)
(Address 03DA16)
R-2R resistor ladder
D-A1 output enable bit
P94/DA1
Figure 2.13.1 Block diagram of D-A converter
Rev. 1.0
142