参数资料
型号: SAB-C167CR-L33M
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 33 MHz, MICROCONTROLLER, PQFP144
封装: PLASTIC, MQFP-144
文件页数: 64/89页
文件大小: 1477K
代理商: SAB-C167CR-L33M
C167CR
C167SR
Electrical Parameters
Data Sheet
65
V3.3, 2005-02
Sample time and conversion time of the C167CR’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:
8) During the sample time the input capacitance
CAIN 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
f
BC
ADCON.13|12
(ADSTC)
Sample time
t
S
00
f
CPU / 4
00
t
BC × 8
01
f
CPU / 2
01
t
BC × 16
10
f
CPU / 16
10
t
BC × 32
11
f
CPU / 8
11
t
BC × 64
Assumptions:
f
CPU
= 25 MHz (i.e.
t
CPU = 40 ns), ADCTC = ‘00’, ADSTC = ‘00’
Basic clock
f
BC
=
f
CPU / 4 = 6.25 MHz, i.e. tBC = 160 ns
Sample time
t
S
=
t
BC × 8 = 1280 ns
Conversion
time
t
C
=
t
S + 40 tBC + 2 tCPU = (1280 + 6400 + 80) ns = 7.8 s
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