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AT83C5111 датащи(PDF) 57 Page - ATMEL Corporation

номер детали AT83C5111
подробное описание детали  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5111 датащи(HTML) 57 Page - ATMEL Corporation

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AT8xC5111
4190A–8051–11/02
Clock Selection
The maximum clock frequency for ADC (CONV_CK for Conversion Clock) is defined in
the AC characteristics section. A prescaler is featured (ADCCLK) to generate the
CONV_CK clock from the oscillator frequency.
Figure 3. A/D Converter Clock
The conversion frequency CONV_CK is derived from the oscillator frequency with the
following formulas:
FCkAdc = FOscOut/(512 - 2*CKRL) , if X2 = 0
= FOscOut
, if X2 = 1
and
FCONV_CK = FCkAdc/(2*PRS), if PRS > 0
FCONV_CK = FCkAdc/256, if PRS = 0
Some examples can be found in the 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.
In this mode the power dissipation is about 1 µW.
Voltage Reference
The Vref pin is used to enter the voltage reference for the A/D conversion.
Best accuracy is obtained with 0.9 V
CC < VREF < VCC.
IT ADC Management
An interrupt end-of-conversion will occur when the bit ADEOC is activated and the bit
EADC is set. To re-arm the interrupt the bit ADEOC must be cleared by software.
Figure 4. ADC Interrupt Structure
Prescaler ADCLK
A/D
Converter
CONV_CK
CKADC
/2
F
OscOut
MHz
X2
CKRL
F
CkAdc
Mhz
ADCLK
F
CONV_CK
khz
Conversion
time
µs
16
0
FF
8
12
333
33
16
1
NA
16
32
250
44
ADEOC
ADCON.2
EADC
IE1.1
ADCI



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