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ST7FLCD1
8-bit Analog-to-Digital Converter (ADC)
9
8-bit Analog-to-Digital Converter (ADC)
9.1
Introduction
The on-chip Analog to Digital Converter (ADC) peripheral is a 8-bit, successive approximation
converter with internal Sample and Hold circuitry. This peripheral has up to 4 multiplexed analog
input channels (refer to device pin out description) that allows the peripheral to convert the analog
voltage levels from up to 4 different sources.
The result of the conversion is stored in a 8-bit Data Register. The A/D converter is controlled
through a Control/Status Register.
9.2
Main Features
● 8-bit conversion
● Up to 4 channels with multiplexed input
● Linear successive approximation
● Data register (DR) which contains the results
● Conversion complete status flag
● On/Off bit (to reduce power consumption)
9.3
Functional Description
The high and low level reference voltages are VDD and VSS, respectively. Consequently,
conversion accuracy is degraded by voltage drops and noise in the event of heavily loaded or badly
decoupled power supply lines.
Figure 27: ADC Block Diagram
Sample
Analog
Mux
AIN0
AIN1
AIN2
AIN3
-
COCO
CH0
CH1
-
-
ADON
(Control Status Register) CSR
AD7
AD0
AD1
AD2
AD3
AD6
AD5
(Data Register) DR
&
Hold
fCPU / 4
Analog to Digital
Converter
AD4
-



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