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UPD17708 Datasheet(PDF) 193 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 193 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
14. A/D CONVERTER
14.1 Outline of A/D Converter
Figure 14-1 outlines the A/D converter.
The A/D converter converts an analog voltage input to the AD5 to AD0 pins into an 8-bit digital signal.
Two modes can be selected by using the ADCMD flag: software mode and hardware mode.
In the software mode, a voltage input to a pin is compared with an internal reference voltage, and the result
of the comparison is detected by the ADCCMP flag. By judging this result in software and by sequentially
selecting reference voltages, the A/D converter can be used as a successive approximation A/D converter.
In the hardware mode, reference voltages are automatically selected, and the input voltage is directly
detected as 8-bit digital data.
Figure 14-1. Outline of A/D Converter
Remarks 1. ADCCH2 through ADCCH0 (bits 2 through 0 of A/D converter channel selection register: refer
to Figure 14-3) select pins used for the A/D converter.
2. ADCCMP (bit 0 of A/D converter mode selection register: refer to Figure 14-5) detects the
result of comparison.
3. ADCSTT (bit 1 of A/D converter mode selection register: refer to Figure 14-5) detects the
operating status.
4. ADCMD (bit 2 of A/D converter mode selection register: refer to Figure 14-5) selects software
or hardware mode.
P1C3/AD5
P1C2/AD4
P0D3/AD3
P0D2/AD2
P0D1/AD1
P0D0/AD0
ADCCH2 flag
ADCCH1 flag
ADCCH0 flag
Input selection
block
Compare voltage
generation block
R-string
D/A converter
DBF
ADCMD flag
ADCCMP flag
ADCSTT flag
Start/stop control
block
Compare block



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