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C161PI 数据表(PDF) 54 Page - Infineon Technologies AG

部件名 C161PI
功能描述  16-Bit Single-Chip Microcontroller
PDF  82 Pages
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制造商  INFINEON [Infineon Technologies AG]
网页  http://www.infineon.com
标志 INFINEON - Infineon Technologies AG

C161PI 数据表(HTML) 54 Page - Infineon Technologies AG

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Data Sheet
52
1999-07
Sample time and conversion time of the C161PI’s A/D Converter are programmable. The
table below should be used to calculate the above timings.
The limit values for
I
BC must not be exceeded when selecting ADCTC.
Converter Timing Example:
Assumptions:
I
CPU
= 25 MHz (i.e.
W
CPU = 40 ns), ADCTC = ’00’, ADSTC = ’00’.
Basic clock
I
BC
=
I
CPU / 4 = 6.25 MHz, i.e. WBC = 160 ns.
Sample time
W
S
=
W
BC * 8 = 1280 ns.
Conversion time
W
C
=
W
S + 40 WBC + 2 WCPU = (1280 + 6400 + 80) ns = 7.8 µs.
Memory Cycle Variables
The timing tables below use three variables which are derived from the BUSCONx
registers and represent the special characteristics of the programmed memory cycle.
The following table describes, how these variables are to be computed.
Table 9
A/D Converter Computation Table
ADCON.15|14
(ADCTC)
A/D Converter
Basic clock
I
BC
ADCON.13|12
(ADSTC)
Sample time
W
S
00
I
CPU / 4
00
W
BC * 8
01
I
CPU / 2
01
W
BC * 16
10
I
CPU / 16
10
W
BC * 32
11
I
CPU / 8
11
W
BC * 64
Table 10
Memory Cycle Variables
Description
Symbol
Values
ALE Extension
W
A
TCL * <ALECTL>
Memory Cycle Time Waitstates
W
C
2TCL * (15 - <MCTC>)
Memory Tristate Time
W
F
2TCL * (1 - <MTTC>)



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