Datasheet

67
ATmega325/3250/645/6450
2570K–AVR–04/07
• OC1A/PCINT13, Bit 5
OC1A, Output Compare Match A output: The PB5 pin can serve as an external output
for the Timer/Counter1 Output Compare A. The pin has to be configured as an output
(DDB5 set (one)) to serve this function. The OC1A pin is also the output pin for the PWM
mode timer function.
PCINT13, Pin Change Interrupt Source 13: The PB5 pin can serve as an external inter-
rupt source.
• OC0A/PCINT12, Bit 4
OC0A, Output Compare Match A output: The PB4 pin can serve as an external output
for the Timer/Counter0 Output Compare A. The pin has to be configured as an output
(DDB4 set (one)) to serve this function. The OC0A pin is also the output pin for the PWM
mode timer function.
PCINT12, Pin Change Interrupt Source 12: The PB4 pin can serve as an external inter-
rupt source.
• MISO/PCINT11 – Port B, Bit 3
MISO: Master Data input, Slave Data output pin for SPI. When the SPI is enabled as a
Master, this pin is configured as an input regardless of the setting of DDB3. When the
SPI is enabled as a Slave, the data direction of this pin is controlled by DDB3. When the
pin is forced to be an input, the pull-up can still be controlled by the PORTB3 bit.
PCINT11, Pin Change Interrupt Source 11: The PB3 pin can serve as an external inter-
rupt source.
• MOSI/PCINT10 – Port B, Bit 2
MOSI: SPI Master Data output, Slave Data input for SPI. When the SPI is enabled as a
Slave, this pin is configured as an input regardless of the setting of DDB2. When the SPI
is enabled as a Master, the data direction of this pin is controlled by DDB2. When the pin
is forced to be an input, the pull-up can still be controlled by the PORTB2 bit.
PCINT10, Pin Change Interrupt Source 10: The PB2 pin can serve as an external inter-
rupt source.
• SCK/PCINT9 – Port B, Bit 1
SCK: Master Clock output, Slave Clock input pin for SPI. When the SPI is enabled as a
Slave, this pin is configured as an input regardless of the setting of DDB1. When the SPI
is enabled as a Master, the data direction of this pin is controlled by DDB1. When the pin
is forced to be an input, the pull-up can still be controlled by the PORTB1 bit.
PCINT9, Pin Change Interrupt Source 9: The PB1 pin can serve as an external interrupt
source.
•SS
/PCINT8 – Port B, Bit 0
SS
: Slave Port Select input. When the SPI is enabled as a Slave, this pin is configured
as an input regardless of the setting of DDB0. As a Slave, the SPI is activated when this
pin is driven low. When the SPI is enabled as a Master, the data direction of this pin is
controlled by DDB0. When the pin is forced to be an input, the pull-up can still be con-
trolled by the PORTB0 bit
PCINT8, Pin Change Interrupt Source 8: The PB0 pin can serve as an external interrupt
source.
Table 28 and Table 29 relate the alternate functions of Port B to the overriding signals
shown in Figure 27 on page 64. SPI MSTR INPUT and SPI SLAVE OUTPUT constitute