MC68HC05P9ACDW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P9ACDW Datasheet - Page 124

• Manufacturer Part Number: MC68HC05P9ACDW
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

ADC
124
CH[2:0] — Channel Select Bits
To prevent excess power dissipation, do not use an ADC pin as an
analog input and a digital input at the same time.
Using one of the port pins as the ADC input does not affect the ability to
use the remaining port pins as digital inputs.
Reading a port pin that is selected as an analog input returns a logic 0.
These read/write bits select one of eight ADC input channels as
shown in
PC4/AN2, PC5/AN1, and PC6/AN0. Channels 4–6 can be used for
reference measurements. Channel 7 is reserved for factory testing.
Freescale Semiconductor, Inc.
For More Information On This Product,
Table
Go to: www.freescale.com
NOTE:
CH[2:1:0]
Table 26. ADC Input Channel Selection
1. The accuracy of these measurements are
untested and not guaranteed.
000
001
010
011
100
101
110
111
26. Channels 0–3 are the input pins, PC3/AN3,
ADC
Channel
0
1
2
3
4
5
6
7
V
V
(V
RH
SS
(see Note 1)
RH
Reserved
(see Note 1)
(see Note 1)
Signal
AN0
AN1
AN2
AN3
+ V
SS
) / 2
12-mc68hc05p9a
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