A/D Converter Functional Overview - Intel 8XC196MC User Manual

ANALOG-TO-DIGITAL (A/D) CONVERTER
The analog-to-digital (A/D) converter can convert an analog input voltage to a digital value and
set the A/D interrupt pending bit when it stores the result. It can also monitor a pin and set the
A/D interrupt pending bit when the input voltage crosses over or under a programmed threshold
voltage. This chapter describes the A/D converter and explains how to program it.

12.1 A/D CONVERTER FUNCTIONAL OVERVIEW

The A/D converter (Figure 12-1) can convert an analog input voltage to an 8- or 10-bit digital
result and set the A/D interrupt pending bit when it stores the result. It can also monitor an input
and set the A/D interrupt pending bit when the input voltage crosses over or under the pro-
grammed threshold voltage.
Analog Inputs
†
Analog Mux
Sample
and Hold
† Multiplexed with port inputs
V ANGND
REF
Successive
Approximation
A/D
Converter
Status
AD_RESULT
Figure 12-1. A/D Converter Block Diagram
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EPA or PTS
Command
Control
Logic
AD_COMMAND AD_TIME
CHAPTER 12
AD_TEST
A2652-02
12-1