Table 12-5. Overriding Signals for Alternate Functions in PA3..PA0
Signal Name
PA3/COM3
PA2/COM2
PA1/COM1
PA0/COM0
LCDEN
0
LCDEN •
(LCDMUX>2)
LCDEN •
(LCDMUX>1)
LCDEN •
(LCDMUX>0)
PUOE
PUOV
0
0
0
LCDEN •
(LCDMUX>2)
LCDEN •
(LCDMUX>1)
LCDEN •
(LCDMUX>0)
DDOE
LCDEN
DDOV
PVOE
PVOV
PTOE
0
0
0
–
0
0
0
–
0
0
0
–
0
0
0
–
LCDEN •
(LCDMUX>2)
LCDEN •
(LCDMUX>1)
LCDEN •
(LCDMUX>0)
DIEOE
LCDEN
DIEOV
0
0
0
0
DI
AIO
–
–
–
–
COM3
COM2
COM1
COM0
12.3.2
Alternate Functions of Port B
The Port B pins with alternate functions are shown in Table 12-6.
Table 12-6. Port B Pins Alternate Functions
Port Pin
Alternate Functions
OC2A/PCINT15 (Output Compare and PWM Output A for Timer/Counter2 or Pin Change
Interrupt15).
PB7
OC1B/PCINT14 (Output Compare and PWM Output B for Timer/Counter1 or Pin Change
Interrupt14).
PB6
PB5
PB4
OC1A/PCINT13 (Output Compare and PWM Output A for Timer/Counter1 or Pin Change
Interrupt13).
OC0A/PCINT12 (Output Compare and PWM Output A for Timer/Counter0 or Pin Change
Interrupt12).
PB3
PB2
PB1
PB0
MISO/PCINT11 (SPI Bus Master Input/Slave Output or Pin Change Interrupt11).
MOSI/PCINT10 (SPI Bus Master Output/Slave Input or Pin Change Interrupt10).
SCK/PCINT9 (SPI Bus Serial Clock or Pin Change Interrupt9).
SS/PCINT8 (SPI Slave Select input or Pin Change Interrupt8).
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.
PCINT15, Pin Change Interrupt source 15: The PB7 pin can serve as an external interrupt
source.
74
ATmega169P
8018A–AVR–03/06
ATMEL [ ATMEL ]
