參數(shù)資料
型號(hào)： UPD17207GF
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機(jī)與LCD控制器/驅(qū)動(dòng)器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 47/120頁
文件大?。?/td> 516K
代理商： UPD17207GF
μ
PD17201A, 17207
47
9.2 FUNCTION OF A/D CONVERTER
9.2.1 Function in A/D Conversion Mode
In the A/D conversion mode, the A/D converter compares an analog voltage input to one of the pins ADC3 through
AD0 with an internal reference voltage and outputs the result to ADCCMP on the register file.
The pin from which an analog voltage is to be input is selected by the operation mode register (refer to
Figure
9-2
). Two or more pins cannot be selected for A/D conversion at the same time.
The internal reference voltage is created by the 8-bit D/A converter based on the data set by the internal reference
voltage setting register (ADCR). The 8-bit D/A converter can create 256 values of the internal reference voltage.
By selecting an internal reference voltage and executing successive approximation in software, the input analog
voltage can be converted into a digital value.
Operation Mode Register
Selected
Function
VREFEN
ADCEN
ADCCH1 ADCCH0
Input Pin
1
1
0
0
ADC
0
Compares analog voltage input to ADC
0
pin with internal reference voltage
0
1
ADC
1
Compares analog voltage input to ADC
1
pin with internal reference voltage
1
0
ADC
2
Compares analog voltage input to ADC
2
pin with internal reference voltage
1
1
ADC
3
Compares analog voltage input to ADC
3
pin with internal reference voltage
9.2.2 Function in Compare Mode
In the compare mode, analog voltages input two of the pins ADC
3
through ADC
0
are compared with each other
and the result is output to ADCCMP in the register file. The two pins from which analog voltages are to be input are
selected by the operation mode register (refer to
Figure 9-2
).
Two pairs of pins can be selected: pins ADC
2
and ADC
0
, pins or ADC
3
and ADC
1
. Both pairs of pins cannot be
selected at the same time.
Operation Mode Register
Selected
Function
VREFEN
ADCEN
ADCCH1 ADCCH0
Input Pin
0
0
1
0
ADC
2
ADC
0
Compares analog voltages input to ADC
2
and ADC
0
pins
1
1
ADC
3
ADC
1
Compares analog voltages input to ADC
3
and ADC
1
pins
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