參數(shù)資料
型號(hào)： C164CM
廠商： INFINEON TECHNOLOGIES AG
英文描述： 16-Bit Single-Chip Microcontrol ler
中文描述： 16位單芯片Microcontrol萊爾
文件頁(yè)數(shù)： 58/68頁(yè)
文件大?。?/td> 1107K
代理商： C164CM
C164CM
C164SM
Data Sheet
54
V1.0, 2001-05
Sample time and conversion time of the C164CM
’
s A/D Converter are programmable.
Table 14
should be used to calculate the above timings.
The limit values for
f
BC
must not be exceeded when selecting ADCTC.
Converter Timing Example:
Assumptions:
Basic clock
Sample time
Conversion time
f
CPU
f
BC
t
S
t
C
= 25 MHz (i.e.
t
CPU
= 40 ns), ADCTC =
‘
00
’
, ADSTC =
‘
00
’
.
=
f
CPU
/4 = 6.25 MHz, i.e.
t
BC
= 160 ns.
=
t
BC
×
8 = 1280 ns.
=
t
S
+ 40
t
BC
+ 2
t
CPU
= (1280 + 6400 + 80) ns = 7.8
μ
s.
8)
During the sample time the input capacitance
C
AIN
can be charged/discharged by the external source. The
internal resistance of the analog source must allow the capacitance to reach its final voltage level within
t
S
.
After the end of the sample time
t
S
, changes of the analog input voltage have no effect on the conversion result.
Values for the sample time
t
S
depend on programming and can be taken from
Table 14
.
Table 14
A/D Converter Computation Table
ADCON.15|14
(ADCTC)
00
01
10
11
A/D Converter
Basic Clock
f
BC
f
CPU
/ 4
f
CPU
/ 2
f
CPU
/ 16
f
CPU
/ 8
ADCON.13|12
(ADSTC)
00
01
10
11
Sample time
t
S
t
BC
×
8
t
BC
×
16
t
BC
×
32
t
BC
×
64
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