PCIF0 datasheet(81/294 Pages) ATMEL

81 / 294 page

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

Master, the data direction of this pin is controlled by DDA3. When the pin is forced by

the SPI to be an input, the pull-up can still be controlled by the PORTA3 bit.

• PCINT3/ADC3/ISRC/INT1 – Port A, Bit 3

PCINT3: Pin Change Interrupt, source 3.

ADC3: Analog to Digital Converter, channel 3.

ISCR: Current Source Output pin. While current is sourced by the Current Source module,

the user can use the Analog to Digital Converter channel 4 (ADC4) to measure the pin

voltage.

INT1: External Interrupt, source 1. The PA4 pin can serve as an external interrupt source.

• PCINT2/ADC2/OC0A/DO/MISO – Port A, Bit 2

PCINT2: Pin Change Interrupt, source 2.

ADC2: Analog to Digital Converter, channel 2.

OC0A: Output Compare Match A or output PWM A for Timer/Counter0. The pin has to be

configured as an output (DDA2 set (one)) to serve these functions.

DO: Three-wire Mode USI Data Output. Three-wire mode data output overrides PORTA2

and it is driven to the port when the data direction bit DDA2 is set. PORTA2 still

enables the pull-up, if the direction is input and PORTA2 is set (one).

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 DDA2. When

the SPI is enabled as a Salve, the data direction of this pin is controlled by DDA2.

When the pin is forced to be an input, the pull-up can still be controlled by PORTA2.

• PCINT1/ADC1/TXD/TXLIN – Port A, Bit 1

PCINT1: Pin Change Interrupt, source 1.

ADC1: Analog to Digital Converter, channel 1.

TXD: UART Transmit pin. When the UART transmitter is enabled, this pin is configured as an

output regardless the value of DDA1. PORTA1 still enables the pull-up, if the direction

is input and PORTA2 is set (one).

TXLIN: LIN Transmit pin. When the LIN is enabled, this pin is configured as an output

regardless the value of DDA1. PORTA1 still enables the pull-up, if the direction is input

and PORTA2 is set (one).

• PCINT0/ADC0/RXD/RXLIN – Port A, Bit 0

PCINT0: Pin Change Interrupt, source 0.

ADC0: Analog to Digital Converter, channel 0.

RXD: UART Receive pin. When the UART receiver is enabled, this pin is configured as an

input regardless of the value of DDA0. When the pin is forced to be an input, a logical

one in PORTA0 will turn on the internal pull-up.

RXLIN: LIN Receive pin. When the LIN is enabled, this pin is configured as an input regard-

less of the value of DDA0. When the pin is forced to be an input, a logical one in

PORTA0 will turn on the internal pull-up.

Table 9-4 and Table 9-5 relate the alternate functions of Port A to the overriding signals shown

in Figure 9-6 on page 76.

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