参数资料
型号: AT83EB5114XXXTGRIL
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO20
封装: SO-20
文件页数: 61/95页
文件大小: 1126K
代理商: AT83EB5114XXXTGRIL
61
4311A–8051–01/05
Figure 29.
A/D Converter clock
The conversion frequency CONV_CK is derived from the oscillator frequency with the
following formulas:
F
CkAdc
= F
OscOut
/ (32 - 2*CKRL), if X2=0
= F
OscOut , if X2=1
and
F
CONV_CK
= F
CkAdc
/ (2*PRS), if PRS > 0
F
CONV_CK
= F
CkAdc
/ 256, if PRS = 0
Some examples can be found on table below:
ADC Standby Mode
When the ADC is not used, it is possible to set it in standby mode by clearing bit ADEN
in ADCON register.
Voltage Reference
The voltage reference can be either internal or external.
As input, the V
REF
pin is used to enter the voltage reference for the A/D conversion.
When the voltage reference is active, the V
REF
pin is an output. This voltage can be
used for the A/D and for any other application requiring a voltage independent from the
power supply. Voltage typical value is 2.4 volt (See “DC Parameters for A/D Converter”
on page 88.)
IT ADC Management
An interrupt end-of-conversion will occur when the bit ADEOC is activated and the bit
EADC is set. For re-arming the interrupt the bit ADEOC must be cleared by software.
Figure 30.
ADC Interrupt Structure
F
OscOut
MHz
X2
CKRL
F
CkAdc
Mhz
PRSw
F
CONV_CK
khz
Conversion
time
μ
s
16
0
F
8
12
333
33
16
1
NA
16
32
250
44
Prescaler PRS
A/D
Converter
CONV_CK
CKADC
/ 2
ADEOC
ADCON.4
EADC
IE0.6
ADCI
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