参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 29/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
ADC
124
ADC
CH[2:0] — Channel Select Bits
These read/write bits select one of eight ADC input channels as
shown in Table 26. Channels 0–3 are the input pins, PC3/AN3,
PC4/AN2, PC5/AN1, and PC6/AN0. Channels 4–6 can be used for
reference measurements. Channel 7 is reserved for factory testing.
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.
Table 26. ADC Input Channel Selection
CH[2:1:0]
Channel
Signal
000
0
AN0
001
1
AN1
010
2
AN2
011
3
AN3
100
4
V
RH (see Note 1)
101
5
(V
RH + VSS) / 2
(see Note 1)
110
6
V
SS (see Note 1)
111
7
Reserved
NOTE:
1. The accuracy of these measurements are
untested and not guaranteed.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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