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CHAPTER 10 A/D CONVERTER

(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

conversion from among the channels set for analog input with ADIS.

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).

Figure 10-3. A/D Converter Input Select Register Format

ADIS3

3210

FF84H

Address

ADIS

Symbol

ADIS2 ADIS1 ADIS0

00H

After

Reset

R/W

ADIS3

Other than above

Number of Analog Input Channel Selection

No analog input channel (P10-P17)

1 channel (ANI0, P11-P17)

2 channel (ANI0, ANI1, P12-P17)

3 channel (ANI0-ANI2, P13-P17)

4 channel (ANI0-ANI3, P14-P17)

5 channel (ANI0-ANI4, P15-P17)

6 channel (ANI0-ANI5, P16, P17)

7 channel (ANI0-ANI6, P17)

8 channel (ANI0-ANI7)

Setting prohibited

ADIS2

ADIS1

ADIS0

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Ibm uPD78082 Bedienungsanleitung Seite 147