ST72F264G ST Microelectronics, ST72F264G Datasheet - Page 112

• Manufacturer Part Number: ST72F264G
• Description: (ST72F260G - ST72F264G) 8-BIT MCU
• Manufacturer: ST Microelectronics

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ST72260G, ST72262G, ST72264G
11.7 10-BIT A/D CONVERTER (ADC)
11.7.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 10-bit, successive approximation con-
verter with internal sample and hold circuitry. This
peripheral has 6 multiplexed analog input chan-
nels (refer to device pin out description) that allow
the peripheral to convert the analog voltage levels
from 6 different sources.
The result of the conversion is stored in a 10-bit
Data Register. The A/D converter is controlled
through a Control/Status Register.
11.7.2 Main Features
Figure 61. ADC Block Diagram
112/171
10-bit conversion
6 channels with multiplexed input
Linear successive approximation
AIN0
AIN1
AINx
4
f
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ANALOG
MUX
EOC SPEEDADON SLOW
f
CPU,
3
ADCDRH
f
CPU
/2
,
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f
CPU
ADCDRL
/4
D9
0
f
ADC
CH2
D8
The block diagram is shown in
11.7.3 Functional Description
11.7.3.1 Analog Power Supply
V
ence voltage pins. In some devices (refer to device
pin out description) they are internally connected
to the V
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
CH1
D7
DDA
Data register (DR) which contains the results
Conversion complete status flag
On/off bit (to reduce consumption)
0
CH0
and V
D6
DD
0
and V
D5
ADCCSR
SSA
0
D4
are the high and low level refer-
SS
0
ANALOG TO DIGITAL
pins.
D3
CONVERTER
0
D2
0
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Figure
D1
61.
D0
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