atxmega128a4-mu ATMEL Corporation, atxmega128a4-mu Datasheet - Page 37

• Manufacturer Part Number: atxmega128a4-mu
• Description: Atxmega16a4 8/16-bit Avr Xmega Microcontroller
• Manufacturer: ATMEL Corporation

25. AC - Analog Comparator
25.1
25.2
8069A–AVR–02/08
Features
Overview
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The XMEGA A4 features four Analog Comparators (AC). An Analog Comparator compares two
voltages, and the output indicates which input is largest. The Analog Comparator may be config-
ured to give interrupt requests and/or events upon several different combinations of input
change.
Both hysteresis and propagation delays may be adjusted in order to find the optimal operation
for each application.
The Analog Comparators are always grouped in pairs (AC0 and AC1) on each analog port. They
have identical behavior but separate control registers
The AC belongs to PORTA. Notations are ACA0 and ACA1.
Figure 25-1. Analog comparator overview
Two Analog Comparators
Selectable Power vs. Speed
Selectable hysteresis
Analog Comparator output available on pin
Flexible Input Selection
Basic interrupt and event generation on
Window function interrupt and event generation on
– 20 µA/500 ns active current consumption/propagation delay or
– 130 µA/30 ns active current consumption/propagation delay
– 0, 20 mV, 50 mV
– Rising edge
– Falling edge
– Toggle
– Signal above window
– Signal inside window
– Signal below window
Pin inputs
Pin inputs
Internal inputs
Internal inputs
Scaled inputs
Scaled inputs
+
-
sensitivity
Interrupt
control
ATxmega A4
pin output
Events or
Interrupts
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