60
ATmega8535(L)
2502K–AVR–10/06
Alternate Functions Of Port B The Port B pins with alternate functions are shown in Table 26.
The alternate pin configuration is as follows:
• SCK – Port B, Bit 7
SCK: Master Clock output, Slave Clock input pin for SPI channel. When the SPI is
enabled as a Slave, this pin is configured as an input regardless of the setting of DDB7.
When the SPI is enabled as a Master, the data direction of this pin is controlled by
DDB7. When the pin is forced by the SPI to be an input, the pull-up can still be con-
trolled by the PORTB7 bit.
• MISO – Port B, Bit 6
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
DDB6. When the SPI is enabled as a Slave, the data direction of this pin is controlled by
DDB6. When the pin is forced by the SPI to be an input, the pull-up can still be con-
trolled by the PORTB6 bit.
Table 25. Overriding Signals for Alternate Functions in PA3..PA0
Signal Name PA3/ADC3 PA2/ADC2 PA1/ADC1 PA0/ADC0
PUOE0000
PUOV0000
DDOE0000
DDOV0000
PVOE0000
PVOV0000
DIEOE0000
DIEOV0000
DI––––
AIO ADC3 INPUT ADC2 INPUT ADC1 INPUT ADC0 INPUT
Table 26. Port B Pins Alternate Functions
Port Pin Alternate Functions
PB7 SCK (SPI Bus Serial Clock)
PB6 MISO (SPI Bus Master Input/Slave Output)
PB5 MOSI (SPI Bus Master Output/Slave Input)
PB4 SS
(SPI Slave Select Input)
PB3
AIN1 (Analog Comparator Negative Input)
OC0 (Timer/Counter0 Output Compare Match Output)
PB2
AIN0 (Analog Comparator Positive Input)
INT2 (External Interrupt 2 Input)
PB1 T1 (Timer/Counter1 External Counter Input)
PB0
T0 (Timer/Counter0 External Counter Input)
XCK (USART External Clock Input/Output)
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