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參數(shù)資料
| 型號(hào)： | MC68HC05P18A |
| 廠商： | Motorola, Inc. |
| 英文描述： | Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器) |
| 中文描述： | 低成本HCMOS微控制器（低成本，8位HCMOS微控制器） |
| 文件頁(yè)數(shù)： | 95/130頁(yè) |
| 文件大小： | 1200K |
| 代理商： | MC68HC05P18A |
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Analog-to-Digital (A/D) Converter
A/D Status and Control Register
MC68HC05P18A
Technical Data
MOTOROLA
Analog-to-Digital (A/D) Converter
95
L
G
R
R — Reserved Bit
This bit is not currently used. It can be read or written, but does not
control anything.
ADON — A/D Subsystem On Bit
When the A/D subsystem is turned on (ADON = 1), it requires a time
t
ADON
to stabilize before accurate conversion results can be attained.
CH2–CH0 — Channel Select Bits
CH2, CH1, and CH0 form a 3-bit field that is used to select an input to
the A/D converter. Channels 0–3 correspond to port C input pins
PC6–PC3. Channels 4–6 are used for reference measurements. In
user mode, channel 7 is reserved. If a conversion is attempted with
channel 7 selected, the result is $00.
Table 11-1
lists the inputs
selected by bits CH0–CH3.
If the ADON bit is set, and an input from channels 0–4 is selected, the
corresponding port C pin’s DDR bit is cleared (making that port C pin
an input). If the port C data register is read while the A/D is on, and
one of the shared input channels is selected using bit CH0–CH2, the
correspondingportCpinreadsasalogic0.TheremainingportCpins
read normally. To digitally read a port C pin, the A/D subsystem must
be disabled (ADON = 0) or input channel 5–7 must be selected.
Table 11-1. A/D Multiplexer Input
Channel Assignments
Channel
Signal
0
AD0 port C bit 6
1
AD1 port C bit 5
2
AD2 port C bit 4
3
AD3 port C bit 3
4
V
REFH
port C bit 7
(V
REFH
+ V
SS
)/2
V
SS
Reserved
5
6
7
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