at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 196

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

17.3
17.4
196
Shared pins between Analog Comparator and ADC
Analog Comparator Register Description
AT90PWM81
Figure 17-2.
Several Analog comparators input pins can also be used as ADC inputs, so it is possible to measure the
comparison voltages. However, when a comparator input is selected as the ADC input, a spike occurs dur-
ing the sampling phase of the ADC. This may lead to an unwanted transition on the comparator output. So
it is a safe software practice to devalidate the comparator output before measuring the voltage on one of
the inputs.
Each analog comparator has its own control register.
A dedicated register has been designed to consign the outputs and the flags of the 3 analog comparators.
ACM PM3
ACM PM1
ACM PM2
PSCIN2A
PSCIN 2
PSCINrA
PSCINrB
ACM P1
ACM P2
ACM P3
PSCINr
Comparator PSC links
+
-
+
-
AC1 EN
AC2 EN
+
-
AC3 EN
PSC2
PSCR
7734M–AVR–03/10