ATmega32HVB datasheet(75/273 Pages) ATMEL

75 / 273 page

8042A–AVR–07/09

ATmega16HVB/32HVB

These pins can serve as external interrupt sourceTable 15-4 relates the alternate functions of

Port A to the overriding signals shown in Figure 15-5 on page 72.

15.3.2

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 15-5.

The alternate pin configuration is as follows:

• MISO/PCINT11 - Port B, Bit7

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 DDB7. When the SPI is

enabled as a Slave, 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 controlled by the PORTB7 bit. When not operat-

ing in SPI mode, this pin can serve as an external interrupt source.

PCINT11: Pin Change Interrupt 11. This pin can serve as external interrupt source.

Table 15-4.

Overriding Signals for Alternate Functions in PA3:PA0

Signal Name

PA3/T1/PCINT3

PA2/T0/PCINT2

PA1/ADC1/SGND/PCINT1

PA0/ADC0/SGND/PCINT0

PUOE

PUOV

DDOE

VADSC • VADMUX=ADC0

VADSC • VADMUX=ADC1

DDOV

PVOE

VADSC • VADMUX=ADC0

VADSC • VADMUX=ADC1

PVOV

PTOE

DIEOE

PCINT3 • PCIE0

PCINT2 • PCIE0

DIDR1| (PCINT1 • PCIE0)

DIDR0 | (PCINT0 • PCIE0)

DIEOV

DIDR1

DIDR0

T1 INPUT

PCINT3 INPUT

T0 INPUT

PCINT2 INPUT

PCINT1 INPUT

PCINT0 INPUT

AIO

ADC1 INPUT/ SGND

ADC0 INPUT/ SGND

Table 15-5.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

MISO/PCINT11 (SPI Bus Master Input/Slave Output or Pin Change Interrupt 11)

PB6

MOSI/PCINT10 (SPI Bus Master Output/Slave Input or Pin Change Interrupt 10)

PB5

SCK/PCINT9 (SPI Bus Serial Clock or Pin Change Interrupt 9)

PB4

SS/PCINT8 (SPI Bus Slave Select input or Pin Change Interrupt 8)

PB3

PCINT7 (Pin Change Interrupt 7)

PB2

PCINT6 (Pin Change Interrupt 6)

PB1

CKOUT/PCINT5 (Clock output or Pin Change Interrupt 5)

PB0

PCINT4/ICP00 (Pin Change Interrupt 4

or Timer/Counter0 Input Capture Trigger)

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