参数资料
型号: SAF-C505CA-4R
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封装: METRIC, PLASTIC, QFP-44
文件页数: 37/88页
文件大小: 1224K
代理商: SAF-C505CA-4R
C505/C505C/C505A/C505CA
Data Sheet
38
12.00
8-Bit A/D Converter (C505 and C505C only)
The C505/C505C includes a high performance / high speed 8-bit A/D converter (ADC) with 8 analog
input channels. It operates with a successive approximation technique and provides the following
features:
– 8 multiplexed input channels (port 1), which can also be used as digital outputs/inputs
– 8-bit resolution
– Internal start-of-conversion trigger
– Interrupt request generation after each conversion
– Single or continuous conversion mode
The 8-bit ADC uses two clock signals for operation : the conversion clock fADC (=1/tADC) and the
input clock fIN (1/tIN). fADC is derived from the C505 system clock fOSC which is applied at the XTAL
pins via the ADC clock prescaler as shown in Figure 17. The input clock is equal to fOSC. The
conversion clock fADC is limited to a maximum frequency of 1.25 MHz. Therefore, the ADC clock
prescaler must be programmed to a value which assures that the conversion clock does not exceed
1.25 MHz. The prescaler ratio is selected by the bits ADCL1 and ADCL0 of SFR ADCON1.
Figure 17
8-Bit A/D Converter Clock Selection
MCS03299
f OSC
MUX
Clock Prescaler
Conversion Clock
Input Clock
f ADC
IN
f
ADCL1
A / D
Converter
Condition: ADC max
f
< 1.25 MHz
IN
f
= f OSC =
CLP
1
32
8
4
16
ADCL0
MCU System Clock
Rate (fOSC)
fIN
[MHz]
Prescaler
Ratio
fADC
[MHz]
ADCL1
ADCL0
2 MHz
2
÷ 4
0.5
0
5 MHz
5
÷ 4
1.25
0
6 MHz
6
÷ 8
0.75
0
1
10 MHz
10
÷ 8
1.25
0
1
12 MHz
12
÷ 16
0.75
1
0
16 MHz
16
÷ 16
110
20 MHz
20
÷ 16
1.25
1
0
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