ADUC812 Analog Devices, ADUC812 Datasheet - Page 13

• Manufacturer Part Number: ADUC812
• Description: Precision Analog Microcontroller: 1.3MIPS 8052 MCU + 8kB Flash + 8-Ch 12-Bit ADC + Dual 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC812

• Mcu Core: 8052
• Mcu Speed (mips): 1.3
• Sram (bytes): 256Bytes
• Gpio Pins: 34
• Adc # Channels: 8

REV. E
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
ADCCON1.7 MD1
ADCCON1.6 MD0
ADCCON1.5 CK1
ADCCON1.4 CK0
ADCCON1.3 AQ1
ADCCON1.2 AQ0
ADCCON1.1 T2C
ADCCON1.0 EXC
M
D
1
Name
M
D
0
Description
The mode bits (MD1, MD0) select the active operating mode of the ADC as follows:
MD1 MD0 Active Mode
ADC clock. A typical ADC conversion will require 17 ADC clocks. The divider ratio is selected
The ADC acquisition select bits (AQ1, AQ0) select the time provided for the input track-and-hold
amplifier to acquire the input signal, and are selected as follows:
The Timer 2 conversion bit (T2C) is set by the user to enable the Timer 2 overflow bit be used as
The external trigger enable bit (EXC) is set by the user to allow the external CONVST pin to be
0
0
1
1
Note: In power-down mode the ADC V
powered down, thus minimizing current consumption.
The ADC clock divide bits (CK1, CK0) select the divide ratio for the master clock used to generate the
as follows:
CK1 CK0 MCLK Divider
0
0
1
1
AQ1 AQ0 #ADC Clks
0
0
1
1
the ADC convert start trigger input. ADC conversions are initiated on the second Timer 2 overflow.
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.
EFH
20H
C
0
1
0
1
0
1
0
1
0
1
0
1
K
1
Table III. ADCCON1 SFR Bit Designations
ADC powered down
ADC normal mode
ADC powered down if not executing a conversion cycle
ADC standby if not executing a conversion cycle
1
2
4
8
1
2
4
8
C
K
0
–13–
REF
A
Q
circuits are maintained on, whereas all ADC peripherals are
1
A
Q
0
T
2
C
ADuC812
E
X
C