
68
2552K–AVR–04/11
ATmega329/3290/649/6490
13.3.2
Alternate Functions of Port B
The Port B pins with alternate functions are shown in
Table 13-6.
The alternate pin configuration is as follows:
OC2A/PCINT15, Bit 7
OC2, Output Compare Match A output: The PB7 pin can serve as an external output for the
Timer/Counter2 Output Compare A. The pin has to be configured as an output (DDB7 set (one))
to serve this function. The OC2A pin is also the output pin for the PWM mode timer function.
Table 13-5.
Overriding Signals for Alternate Functions in PA3..PA0
Signal
Name
PA3/COM3
PA2/COM2
PA1/COM1
PA0/COM0
PUOE
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
PUOV
000
0
DDOE
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
DDOV
0
PVOE
000
0
PVOV
000
0
PTOE
–––
–
DIEOE
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
(LCDMUX)
LCDEN
DIEOV
000
0
DI
–––
–
AIO
COM3COM2COM1
COM0
Table 13-6.
Port B Pins Alternate Functions
Port Pin
Alternate Functions
PB7
OC2A/PCINT15 (Output Compare and PWM Output A for Timer/Counter2 or
Pin Change Interrupt15).
PB6
OC1B/PCINT14 (Output Compare and PWM Output B for Timer/Counter1 or
Pin Change Interrupt14).
PB5
OC1A/PCINT13 (Output Compare and PWM Output A for Timer/Counter1 or
Pin Change Interrupt13).
PB4
OC0A/PCINT12 (Output Compare and PWM Output A for Timer/Counter0 or
Pin Change Interrupt12).
PB3
MISO/PCINT11 (SPI Bus Master Input/Slave Output or Pin Change
Interrupt11).
PB2
MOSI/PCINT10 (SPI Bus Master Output/Slave Input or Pin Change
Interrupt10).
PB1
SCK/PCINT9 (SPI Bus Serial Clock or Pin Change Interrupt9).
PB0
SS/PCINT8 (SPI Slave Select input or Pin Change Interrupt8).