at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 78

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

10.3.4
78
AT90PWM81
Alternate Functions of Port E
Table 10-8.
The Port E pins with alternate functions are shown in
Table 10-9.
The alternate pin configuration is as follows:
• AREF/ADC6, Bit 3
AREF: Analog reference voltage. See
ADC6, Analog to Digital Converter, input channel 6
This pin can only be used as a digital output pin. It cannot be read as a digital input.
• XTAL2/ACMP1M/PSCINr – Bit 2
XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal Oscillator or Low-frequency crystal
Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
Port Pin
PE2
PE1
PE0
Alternate Function
XTAL2: XTAL Output
ACMP1M (Analog Comparator 1 Negative Input)
PCSINr (PSCR Digital Input)
XTAL1: XTAL Input
PCSIN2 (PSC 2 Digital Input)
ACMP1_OUT (Analog Comparator 1 Output.)
RESET (Reset Input)
OCD (On Chip Debug I/O)
INT2 (External Interrupt 2 Input)
Overriding Signals for Alternate Functions in PD3..PD0
Port E Pins Alternate Functions
PD3/ADC1/
ACMP2_OUT
Table 18-3 on page 217
PD2/ADC0/
ACMP1
.
Table
10-9.
PD1/PSCOUTR0/
PSCINrB
for the definition of this pin.
PD0/ACMP2_OUT/
SS/CLKO
7734M–AVR–03/10