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(2) A/D converter input select register (ADIS)
This register determines whether the ANI0/P10 to ANI7/P17 pins should be used for analog input channels or
ports. The pins which are not selected for analog input pins can be used as the input/output port.
ADIS is set with an 8-bit memory manipulation instruction.
RESET input sets ADIS to 00H.
Cautions 1. Set the analog input channel in the following order.
Symbol
ADIS
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(1) Set the number of analog input channels with ADIS.
(2) Using the A/D converter mode register (ADM), select one channel to undergo A/D conversion
among the channels which is set for analog input with ADIS.
2. On-chip pull-up resistor is not used for the channels set for analog input with ADIS, irrespective
of the value of bit 1 (PUO1) of the pull-up resistor option register.
Figure 14-3. A/D Converter Input Select Register Format
7
6
5
4
0
0
0
0
ADIS3 ADIS2 ADIS1 ADIS0
CHAPTER 14 A/D CONVERTER
3
2
1
0
ADIS3 ADIS2 ADIS1 ADIS0
Address
When Reset
R/W
FF84H
00H
R/W
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
Other than above
Number of Analog
Input Channel
Selection
No analog input
channel (P10 to
P17)
1 channel (ANI0,
P11 to P17)
2 channels (ANI0,
ANI1, P12 to P17)
3 channels (ANI0 to
ANI2, P13 to P17)
4 channels (ANI0 to
ANI3, P14 to P17)
5 channels (ANI0 to
ANI4, P15 to P17)
6 channels (ANI0 to
ANI5, P16, P17)
7 channels (ANI0 to
ANI6, P17)
8 channels (ANI0 to
ANI7)
Setting prohibited
253
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