參數(shù)資料
型號： ADUC831BS
廠商： ANALOG DEVICES INC
元件分類： 微控制器/微處理器
英文描述： MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU
中文描述： 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52
封裝： PLASTIC, MQFP-52
文件頁數(shù)： 19/76頁
文件大?。?/td> 1211K
代理商： ADUC831BS
REV. 0
ADuC831
–19–
Table III. ADCCON1 SFR Bit Designations
Bit
Name
Description
ADCCON1.7
MD1
The Mode bit selects the active operating mode of the ADC.
Set by the user to power up the ADC.
Cleared by the user to power down the ADC.
Set by the user to select an external reference.
Cleared by the user to use the internal reference.
The ADC clock divide bits (CK1, CK0) select the divide ratio for the master clock used to generate the
ADC clock. To ensure correct ADC operation, the divider ratio must be chosen to reduce the ADC clock
to 4.5 MHz and below. A typical ADC conversion will require 17 ADC clocks.
The divider ratio is selected as follows:
CK1
CK0
MCLK Divider
0
0
16
0
1
2
1
0
4
1
1
8
ADCCON1.6
EXT_REF
ADCCON1.5
ADCCON1.4
CK1
CK0
ADCCON1.3
ADCCON1.2
AQ1
AQ0
The ADC acquisition select bits (AQ1, AQ0) select the time provided for the input track-and-hold amplifier
to acquire the input signal. An acquisition of three or more ADC clocks is recommended; clocks are
selected as follows:
AQ1
AQ0 #ADC Clks
0
0
1
0
1
2
1
0
3
1
1
4
ADCCON1.1
T2C
The Timer 2 conversion bit (T2C) is set by the user to enable the Timer 2 overflow bit be used as
the ADC convert start trigger input.
The external trigger enable bit (EXC) is set by the user to allow the external Pin P3.5 (CONVST) to
be used as the active low convert start input. This input should be an active low pulse (minimum
pulsewidth >100 ns) at the required sample rate.
ADCCON1.0
EXC
ADCCON1 – (ADC Control SFR #1)
The ADCCON1 register controls conversion and acquisition
times, hardware conversion modes and power-down modes as
detailed below.
SFR Address:
SFR Power-On Default Value:
Bit Addressable:
EFH
00H
NO
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