Rainbow-electronics ATmega32L Manual de usuario descargar pdf (Pagina 55)

ATmega32(L)

2503C–AVR–10/02

Alternate Functions of Port B The Port B pins with alternate functions are shown in Table 25.

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

Table 24. Overriding Signals for Alternate Functions in PA3..PA0

Signal Name PA3/ADC3 PA2/ADC2 PA1/ADC1 PA0/ADC0

PUOE 0000

PUOV 0000

DDOE 0000

DDOV 0000

PVOE 0000

PVOV 0000

DIEOE 0000

DIEOV 0000

DI ––––

AIO ADC3 INPUT ADC2 INPUT ADC1 INPUT ADC0 INPUT

Table 25. 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)

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 312 313

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