参数资料
型号: MC68HC05V12CFNR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 83/135页
文件大小: 2080K
代理商: MC68HC05V12CFNR2
51
XMEGA B3 [DATASHEET]
8074D–AVR–08/2013
30.
AC – Analog Comparator
30.1
Features
Two Analog Comparators (AC)
Selectable hysteresis
No
Small
Large
Analog comparator output available on pin
Flexible input selection
All pins on the port
Bandgap reference voltage
A 64-level programmable voltage scaler of the internal V
CC voltage
Interrupt and event generation on:
Rising edge
Falling edge
Toggle
Window function interrupt and event generation on:
Signal above window
Signal inside window
Signal below window
Constant current source with configurable output pin selection
30.2
Overview
The analog comparator (AC) compares the voltage levels on two inputs and gives a digital output based on this
comparison. The analog comparator may be configured to generate interrupt requests and/or events upon several
different combinations of input change.
One important property of the analog comparator’s dynamic behavior is the hysteresis. This parameter may be adjusted
in order to achieve the optimal operation for each application.
The input selection includes analog port pins, several internal signals, and a 64-level programmable voltage scaler. The
analog comparator output state can also be output on a pin for use by external devices.
A constant current source can be enabled and output on a selectable pin. This can be used to replace, for example,
external resistors used to charge capacitors in capacitive touch sensing applications.
The analog comparators are always grouped in pairs on each port. These are called analog comparator 0 (AC0) and
analog comparator 1 (AC1). They have identical behavior, but separate control registers. Used as pair, they can be set in
window mode to compare a signal to a voltage range instead of a voltage level.
PORTB has one AC pair. Notation is ACB.
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