ST72521 Datasheet, PDF (152/211 Pages) STMicroelectronics – 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

ST72521
10.9 10-BIT A/D CONVERTER (ADC)
10.9.1 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 up to 16 multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to 16 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.
Figure 81. ADC Block Diagram
f_CPU
DIV 4
DIV 2
0 _fADC
1
10.9.2 Main Features
s 10-bit conversion
s Up to 16 channels with multiplexed input
s Linear successive approximation
s Data register (DR) which contains the results
s Conversion complete status flag
s On/off bit (to reduce consumption)
The block diagram is shown in Figure 81.
EOC SPEED ADON 0 CH3 CH2 CH1 CH0 _ADCCSR
AIN0
AIN1
AINx
4
ANALOG
MUX
ANALOG TO DIGITAL
CONVERTER
ADCDRH
D9 D8 D7 D6 D5 D4 D3 D2
ADCDRL
0 0 0 0 0 0 D1 D0
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