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ST6215C Datasheet(PDF) 53 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST6215C Datasheet(HTML) 53 Page - STMicroelectronics

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9.3 A/D CONVERTER (ADC)
9.3.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter. This peripheral has multiplexed analog in-
put channels (refer to device pin out description)
that allow the peripheral to convert the analog volt-
age levels from different sources.
The result of the conversion is stored in a 8-bit
Data Register. The A/D converter is controlled
through a Control Register.
9.3.2 Main Features
s
8-bit conversion
s
Multiplexed analog input channels
s
Linear successive approximation
s
Data register (DR) which contains the results
s
End of Conversion flag
s
On/Off bit (to reduce consumption)
s
Typical conversion time 70 µs (with an 8 MHz
crystal)
The block diagram is shown in Figure 34.
Figure 34. ADC Block Diagram
OSC
AD
EAI EOC STA PDS
ADCR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
PORT
MUX
ADR2 ADR1
ADR3
ADR7 ADR6 ADR5 ADR4
ADR0
ADR
DIV 12
fADC
fINT
DDRx
ORx
DRx
I/O PORT
OFF
CR3
AD
CR1
AD
CR0
1


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