9.3.3
Alternate Functions of Port C
The Port C pins with alternate functions are shown in Table 9-6.
Table 9-6.
Port C Pins Alternate Functions
Port Pin
Alternate Function
D2A (DAC output )
PC7
PC6
AMP2+ (Analog Differential Amplifier 2 Positive Input)
PCINT15 (Pin Change Interrupt 15)
ADC10 (Analog Input Channel 10)
ACMP1 (Analog Comparator 1 Positive Input )
PCINT14 (Pin Change Interrupt 14)
ADC9 (Analog Input Channel 9)
AMP1+ (Analog Differential Amplifier 1 Input Channel )
ACMP3 (Analog Comparator 3 Positive Input )
PCINT13 (Pin Change Interrupt 13)
PC5
PC4
ADC8 (Analog Input Channel 8)
AMP1- (Analog Differential Amplifier 1 Input Channel )
ACMPN3 (Analog Comparator 3 Negative Input)
PCINT12 (Pin Change Interrupt 12)
T1 (Timer 1 clock input)
RXCAN (CAN Rx Data)
PC3
PC2
PC1
PC0
ICP1B (Timer 1 input capture alternate input)
PCINT11 (Pin Change Interrupt 11)
T0 (Timer 0 clock input)
TXCAN (CAN Tx Data)
PCINT10 (Pin Change Interrupt 10)
PSCIN1 (PSC 1 Digital Input)
OC1B (Timer 1 Output Compare B)
SS_A (Alternate SPI Slave Select)
PCINT9 (Pin Change Interrupt 9)
PSCOUT1A (PSC output 2A)
INT3 (External Interrupt 3)
PCINT8 (Pin Change Interrupt 8)
Note:
On the engineering samples (Parts marked AT90PWM324), the ACMPN3 alternate function is not
located on PC4. It is located on PE2.
The alternate pin configuration is as follows:
• D2A/AMP2+/PCINT15 – Bit 7
D2A, Digital to Analog output
AMP2+, Analog Differential Amplifier 2 Positive Input. Configure the port pin as input with the
internal pull-up switched off to avoid the digital port function from interfering with the function of
the Amplifier.
PCINT15, Pin Change Interrupt 15.
72
ATmega16/32/64/M1/C1
7647F–AVR–04/09
ATMEL [ ATMEL ]
