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CHAPTER 12 A/D CONVERTER
User’s Manual U19780EJ2V0UD
331
Figure 12-5. A/D Converter Sampling and A/D Conversion Timing
ADCS
Wait
period
Conversion time
Conversion time
Sampling
Sampling
timing
INTAD
ADCS
←
1 or ADS rewrite
Sampling
SAR
clear
SAR
clear
Transfer
to ADCR,
INTAD
generation
Successive conversion
(2) A/D converter mode register 1 (ADM1)
This register sets the A/D conversion start trigger.
ADM1 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 12-6. Format of A/D Converter Mode Register 1 (ADM1)
Address: FF3AH After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1
<0>
ADM1
ADTMD
0 0 0 0 0 0
ADTRS
ADTMD
A/D trigger mode selection
0 Software
trigger
mode
1
Timer trigger mode (hardware trigger mode)
ADTRS
Timer trigger signal selection for A/D conversion
0 INTTM000
1 INTTM51
Caution Rewriting ADM1 during A/D conversion is prohibited. Rewrite it when conversion operation is
stopped (ADCS = 0).