ST72T311 ST Microelectronics, ST72T311 Datasheet - Page 77

• Manufacturer Part Number: ST72T311
• Description: 8-BIT MCU WITH 8 TO 16K OTP/EPROM
• Manufacturer: ST Microelectronics

4.6 8-BIT A/D CONVERTER (ADC)
4.6.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter with internal sample and hold circuitry. This
peripheral has up to 8 multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to 8 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.
Figure 43. ADC block diagram
AIN3
AIN4
AIN5
AIN6
AIN7
AIN0
AIN1
AIN2
ANALOG
MUX
f
CPU
SAMPLE
HOLD
&
COCO
AD7
4.6.2 Main Features
The block diagram is shown in Figure 43.
8-bit conversion
Up to 8 channels with multiplexed input
Linear successive approximation
Data register (DR) which contains the results
Conversion complete status flag
On/off bit (to reduce consumption)
AD6
-
ADON
AD5
ANALOG TO
DIGITAL
CONVERTER
(Control Status Register) CSR
AD4
0
AD3
(Data Register) DR
-
ST72E311 ST72T311
CH2
AD2
CH1
AD1
77
CH0
AD0
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