A/D Converter Input Select Register Format - NEC PD78081(A) User Manual

(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. Pins other than those selected as analog input can be used as input/output ports.
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.
(1) Set the number of analog input channels with ADIS.
(2) Using A/D converter mode register (ADM), select one channel to undergo A/D
2. No internal pull-up resistor can be used to the channels set for analog input with ADIS,
irrespective of the value of bit 1 (PUO1) of the pull-up resistor option register L (PUOL).
7
Symbol
0
ADIS
ADIS3
0
0
0
0
0
0
0
0
1
Other than above
124
CHAPTER 10 A/D CONVERTER
conversion from among the channels set for analog input with ADIS.
Figure 10-3. A/D Converter Input Select Register Format
6 5 4 3
0 0 0 ADIS3
ADIS2 ADIS1 ADIS0 Number of Analog Input Channel Selection
0 0 0 No analog input channel (P10-P17)
0 0 1 1 channel (ANI0, P11-P17)
0 1 0 2 channel (ANI0, ANI1, P12-P17)
1 1 3 channel (ANI0-ANI2, P13-P17)
0
1 0 0 4 channel (ANI0-ANI3, P14-P17)
1 0 1 5 channel (ANI0-ANI4, P15-P17)
1 1 0 6 channel (ANI0-ANI5, P16, P17)
1 1 1 7 channel (ANI0-ANI6, P17)
0
0 0 8 channel (ANI0-ANI7)
Setting prohibited
2 1 0 Address
ADIS2 ADIS1 ADIS0
After
R/W
Reset
FF84H 00H R/W