参数资料
型号: SAF-C164CL-8R25M
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP80
封装: 0.65 MM PITCH, METRIC, PLASTIC, QFP-80
文件页数: 57/79页
文件大小: 1314K
代理商: SAF-C164CL-8R25M
C164CI/SI
C164CL/SL
Data Sheet
56
V2.0, 2001-05
Sample time and conversion time of the C164CI’s A/D Converter are programmable.
Table 14 should be used to calculate the above timings.
The limit values for
fBC must not be exceeded when selecting ADCTC.
Converter Timing Example:
Assumptions:
fCPU = 25 MHz (i.e. tCPU = 40 ns), ADCTC = ‘00’, ADSTC = ‘00’.
Basic clock
fBC
=
fCPU/4 = 6.25 MHz, i.e. tBC = 160 ns.
Sample time
tS
=
tBC × 8 = 1280 ns.
Conversion time
tC
=
tS + 40 tBC + 2 tCPU = (1280 + 6400 + 80) ns = 7.8 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
tS.
After the end of the sample time
tS, changes of the analog input voltage have no effect on the conversion result.
Values for the sample time
tS depend on programming and can be taken from Table 14.
Table 14
A/D Converter Computation Table
ADCON.15|14
(ADCTC)
A/D Converter
Basic Clock
fBC
ADCON.13|12
(ADSTC)
Sample time
tS
00
fCPU / 4
00
tBC × 8
01
fCPU / 2
01
tBC × 16
10
fCPU / 16
10
tBC × 32
11
fCPU / 8
11
tBC × 64
相关PDF资料
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SAF-C164CL-8RM 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP80
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