ATA8742-PXQW【PDF 80/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

76页 77页 78页 79页 [80页]81页 82页 83页 84页

9151AINDCO07/09

ATA8742

19.3.1

Alternate Functions of Port A

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

" Port A, Bit 0 ADC0/AREF/PCINT0

ADC0: Analog to Digital Converter, Channel 0.

AREF: External Analog Reference for ADC. Pull-up and output driver are disabled on PA0 when

the pin is used as an external reference or Internal Voltage Reference with external capacitor at

the AREF pin by setting (one) the bit REFS0 in the ADC Multiplexer Selection Register

(ADMUX).

PCINT0: Pin Change Interrupt source 0. The PA0 pin can serve as an external interrupt source

for pin change interrupt 0.

Table 19-3. Port A Pins Alternate Functions

Port Pin

Alternate Function

PA0

ADC0: ADC input channel 0.

AREF: External analog reference.

PCINT0: Pin change interrupt 0 source 0.

PA1

ADC1: ADC input channel 1.

AIN0:

Analog Comparator Positive Input.

PCINT1:Pin change interrupt 0 source 1.

PA2

ADC2: ADC input channel 2.

AIN1:

Analog Comparator Negative Input.

PCINT2: Pin change interrupt 0 source 2.

PA3

ADC3: ADC input channel 3.

T0:

Timer/Counter0 counter source.

PCINT3: Pin change interrupt 0 source 3.

PA4

ADC4: ADC input channel 4.

USCK: USI Clock three wire mode.

SCL : USI Clock two wire mode.

T1:

Timer/Counter1 counter source.

PCINT4: Pin change interrupt 0 source 4.

PA5

ADC5: ADC input channel 5.

DO:

USI Data Output three wire mode.

OC1B: Timer/Counter1 Compare Match B output.

PCINT5: Pin change interrupt 0 source 5.

PA6

ADC6: ADC input channel 6.

DI:

USI Data Input three wire mode.

SDA:

USI Data Input two wire mode.

OC1A: Timer/Counter1 Compare Match A output.

PCINT6: Pin change interrupt 0 source 6.

PA7

ADC7: ADC input channel 7.

OC0B: Timer/Counter0 Compare Match B output.

ICP1:

Timer/Counter1 Input Capture Pin.

PCINT7: Pin change interrupt 0 source 7.

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