AT90CAN128
Alternate Functions of Port B The Port B pins with alternate functions are shown in Table 32.
Table 32. Port B Pins Alternate Functions
Port Pin Alternate Functions
OC0A/OC1C (Output Compare and PWM Output A for Timer/Counter0 or Output
Compare and PWM Output C for Timer/Counter1)
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
OC1B (Output Compare and PWM Output B for Timer/Counter1)
OC1A (Output Compare and PWM Output A for Timer/Counter1)
OC2A (Output Compare and PWM Output A for Timer/Counter2 )
MISO (SPI Bus Master Input/Slave Output)
MOSI (SPI Bus Master Output/Slave Input)
SCK (SPI Bus Serial Clock)
SS (SPI Slave Select input)
The alternate pin configuration is as follows:
• OC0A/OC1C, Bit 7
OC0A, Output Compare Match A output. The PB7 pin can serve as an external output
for the Timer/Counter0 Output Compare A. The pin has to be configured as an output
(DDB7 set “one”) to serve this function. The OC0A pin is also the output pin for the PWM
mode timer function.
OC1C, Output Compare Match C output. The PB7 pin can serve as an external output
for the Timer/Counter1 Output Compare C. The pin has to be configured as an output
(DDB7 set “one”) to serve this function. The OC1C pin is also the output pin for the
PWM mode timer function.
• OC1B, Bit 6
OC1B, Output Compare Match B output. The PB6 pin can serve as an external output
for the Timer/Counter1 Output Compare B. The pin has to be configured as an output
(DDB6 set “one”) to serve this function. The OC1B pin is also the output pin for the PWM
mode timer function.
• OC1A, 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.
• OC2A, Bit 4
OC2A, Output Compare Match A output. The PB4 pin can serve as an external output
for the Timer/Counter2 Output Compare A. The pin has to be configured as an output
(DDB4 set “one”) to serve this function. The OC2A pin is also the output pin for the PWM
mode timer function.
• MISO – Port B, Bit 3
MISO, Master Data input, Slave Data output pin for SPI channel. 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
71
4250E–CAN–12/04
ATMEL [ ATMEL ]
