M306V5ME-XXXSP Datasheet, PDF (153/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V5ME-XXXSP
M306V5EESP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY 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 A-D control register, Figure 2.13.3 shows the D-A register and Figure
2.13.4 shows the D-A converter equivalent circuit.
Table 2.13.1 Performance of D-A converter
Item
Conversion method
Resolution
Analog output pin
R-2R method
8 bits
2 channels
Performance
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
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