參數(shù)資料
型號(hào)： C505CA-L
廠商： INFINEON TECHNOLOGIES AG
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁(yè)數(shù)： 42/88頁(yè)
文件大?。?/td> 1224K
代理商： C505CA-L
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 f
ADC
(=1/t
ADC
) and the
input clock f
IN
(1/t
IN
). f
ADC
is derived from the C505 system clock f
OSC
which is applied at the XTAL
pins via the ADC clock prescaler as shown in
Figure 17
. The input clock is equal to f
OSC
. The
conversion clock f
ADC
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
16
8
4
ADCL0
MCU System Clock
Rate (f
OSC
)
2 MHz
f
IN
[MHz]
Prescaler
Ratio
÷
4
÷
4
÷
8
÷
8
÷
16
÷
16
÷
16
f
ADC
[MHz]
ADCL1
ADCL0
2
0.5
0
0
5 MHz
5
1.25
0
0
6 MHz
6
0.75
0
1
10 MHz
10
1.25
0
1
12 MHz
12
0.75
1
0
16 MHz
16
1
1
0
20 MHz
20
1.25
1
0
相關(guān)PDF資料
PDF描述
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