參數(shù)資料
型號(hào)： HC805P18GRS
英文描述： 68HC805P18 Technical Data
中文描述： 68HC805P18技術(shù)數(shù)據(jù)
文件頁(yè)數(shù)： 59/111頁(yè)
文件大?。?/td> 748K
代理商： HC805P18GRS
GENERAL RELEASE SPECIFICATION
MC68HC805P18
Rev. 1.0
ANALOG-TO-DIGITAL CONVERTER
MOTOROLA
9-3
8
2
3
4
5
6
7
8
9
10
11
12
13
14
A
16
17
18
19
20
When the internal RC oscillator is being used, these limitations apply:
1.
Since the internal RC oscillator is running asynchronously with respect to the
PH2 clock, the conversion complete bit (CC) in the A/D status and control
register must be used to determine when a conversion sequence has been
completed.
2.
Electrical noise will slightly degrade the accuracy of the A/D converter. The
A/D converter is synchronized to read voltages during the quiet period of the
clock driving it. Since the internal and external clocks are not synchronized
the A/D converter occasionally will measure an input when the external clock
is making a transition.
3.
If the PH2 clock is 1 MHz or greater (for instance, external oscillator 2 MHz
or greater), the internal RC oscillator should be turned off and the external
oscillator used as the conversion clock.
9.3.3 Multi-Channel Operation
An input multiplexer allows the A/D converter to select from one of four external
analog signals. Port C pins PC3 through PC6 are shared with the inputs to the
multiplexer.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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