參數(shù)資料
型號(hào)： M30100
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁數(shù)： 119/164頁
文件大小： 3302K
代理商： M30100
deveopment
Tentative Specifications REV.E1
D-A Converter
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
118
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 = V
REF
X n/ 256 (n = 0 to 255)
V
REF
: reference voltage
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 control register and Figure 1.17.3 shows D-A converter equivalent
circuit.
D-A register (8)
R-2R resistance ladder
(Address 00D8
16
)
D-A output enable bit
A
AAAAA
AAAAA
P3
4
/ CLKS
1
/ DA
Figure 1.17.1. Block diagram of D-A converter
Table 1.17.1. Performance of D-A converter
Item
Conversion method
Resolution
Analog output pin
Performance
R-2R method
8 bits
1 channel
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