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Cautions 1. Start conversion (ADCS0 = 1) after 14
If ADCE0 is not used, the conversion result immediately after the setting of bit 7 (ADCS0)
is undefined.
2. The conversion result may be undefined after ADCS0 has been cleared to 0. To read the
conversion result, perform the read operation during A/D conversion. If the conversion
result needs to be read after A/D conversion has been stopped, stop the A/D conversion
operation before the end of the next A/D conversion.
3. Always set bits 1, 2, and 6 to 0.
Remarks 1. f
: Main system clock oscillation frequency
X
2.
The parenthesized values apply to operation at f
(2)
Analog input channel specification register 0 (ADS0)
ADS0 specifies the port used to input the analog voltage to be converted to a digital signal.
ADS0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears ADS0 to 00H.
Figure 10-3. Format of Analog Input Channel Specification Register 0
Symbol
7
6
ADS0
0
0
ADS02
ADS01
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Caution Bits 3 to 7 must be set to 0.
CHAPTER 10 10-BIT A/D CONVERTER
5
4
3
0
0
0
ADS00
0
ANI0
1
ANI1
0
ANI2
1
ANI3
0
ANI4
1
ANI5
0
ANI6
1
ANI7
User's Manual U15331EJ4V1UD
µ
s have elapsed following the setting of ADCE0.
= 5.0 MHz.
X
2
1
0
ADS02
ADS01
ADS00
Analog input channel specification
Address
After reset
R/W
FF84H
00H
R/W
177
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