Z8F6421PM020SC Datasheet, PDF (191/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
171
Analog-to-Digital Converter
Overview
The Analog-to-Digital Converter (ADC) converts an analog input signal to a 10-bit binary
number. The features of the sigma-delta ADC include:
• 12 analog input sources are multiplexed with general-purpose I/O ports
• Interrupt upon conversion complete
• Internal voltage reference generator
• Direct Memory Access (DMA) controller can automatically initiate data conversion
and transfer of the data from 1 to 12 of the analog inputs
Architecture
Figure 34 illustrates the three major functional blocks (converter, analog multiplexer, and
voltage reference generator) of the ADC. The ADC converts an analog input signal to its
digital representation. The 12-input analog multiplexer selects one of the 12 analog input
sources. The ADC requires an input reference voltage for the conversion. The voltage ref-
erence for the conversion may be input through the external VREF pin or generated inter-
nally by the voltage reference generator.
PS019915-1005
Analog-to-Digital Converter