ATA8743-PXQW【PDF 84/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

80页 81页 82页 83页 [84页]85页 86页 87页 88页

9152BINDCO02/10

ATA8743

19.3.2

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 19-7 on page 84.

" Port B, Bit 0 XTAL1/PCINT8

XTAL1: Chip Clock Oscillator pin 1. Used for all chip clock sources except internal calibratable

RC oscillator. When used as a clock pin, the pin can not be used as an I/O pin. When using

internal calibratable RC Oscillator as a chip clock source, PB0 serves as an ordinary I/O pin.

PCINT8: Pin Change Interrupt source 8. The PB0 pin can serve as an external interrupt source

for pin change interrupt 1.

" Port B, Bit 1 XTAL2/PCINT9

XTAL2: Chip Clock Oscillator pin 2. Used as clock pin for all chip clock sources except internal

calibratable RC Oscillator and external clock. When used as a clock pin, the pin can not be used

as an I/O pin. When using internal calibratable RC Oscillator or External clock as a Chip clock

sources, PB1 serves as an ordinary I/O pin.

PCINT9: Pin Change Interrupt source 9. The PB1 pin can serve as an external interrupt source

for pin change interrupt 1.

" Port B, Bit 2 INT0/OC0A/CKOUT/PCINT10

INT0: External Interrupt Request 0.

OC0A: Output Compare Match output: The PB2 pin can serve as an external output for the

Timer/Counter0 Compare Match A. The PB2 pin has to be configured as an output (DDB2 set

(one)) to serve this function. The OC0A pin is also the output pin for the PWM mode timer

function.

CKOUT - System Clock Output: The system clock can be output on the PB2 pin. The system

clock will be output if the CKOUT Fuse is programmed, regardless of the PORTB2 and DDB2

settings. It will also be output during reset.

PCINT10: Pin Change Interrupt source 10. The PB2 pin can serve as an external interrupt

source for pin change interrupt 1.

Table 19-7. Port B Pins Alternate Functions

Port Pin

Alternate Function

PB0

XTAL1: Crystal Oscillator Input.

PCINT8: Pin change interrupt 1 source 8.

PB1

XTAL2: Crystal Oscillator Output.

PCINT9: Pin change interrupt 1 source 9.

PB2

INT0:

External Interrupt 0 Input.

OC0A: Timer/Counter0 Compare Match A output.

CKOUT: System clock output.

PCINT10:Pin change interrupt 1 source 10.

PB3

RESET: Reset pin.

dW:

debugWire I/O.

PCINT11:Pin change interrupt 1 source 11.

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