ATA5505 Datasheet, PDF (85/294 Pages) ATMEL Corporation – High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture

9219A–RFID–01/11
Atmel ATA5505 [Preliminary]
RESET: Reset input pin. When the RSTDISBL Fuse is programmed, this pin functions as a
normal I/O pin, and the part will have to rely on Power-on Reset and Brown-out Reset
as its reset sources. When the RSTDISBL Fuse is unprogrammed, the reset circuitry
is connected to the pin, and the pin can not be used as an I/O pin.
If PB7 is used as a reset pin, DDB7, PORTB7 and PINB7 will all read 0.
dW: When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are unpro-
grammed, the RESET port pin is configured as a wire-AND (open-drain) bi-directional
I/O pin with pull-up enabled and becomes the communication gateway between target
and emulator.
• PCINT14/ADC9/OC1AX/INT0 – Port B, Bit 6
PCINT14: Pin Change Interrupt, source 14.
ADC9: Analog to Digital Converter, channel 9.
OC1AX: Output Compare and PWM Output A-X for Timer/Counter1. The PB6 pin has to be
configured as an output (DDB6 set (one)) to serve this function. The OC1AX pin is
also the output pin for the PWM mode timer function (c.f. OC1AX bit of TCCR1D regis-
ter).
INT0: External Interrupt0 Input. The PB6 pin can serve as an external interrupt source.
• PCINT13/ADC8/OC1BW/XTAL2/CLKO – Port B, Bit 5
PCINT13: Pin Change Interrupt, source 13.
ADC8: Analog to Digital Converter, channel 8.
OC1BW: Output Compare and PWM Output B-W for Timer/Counter1. The PB5 pin has to be
configured as an output (DDB5 set (one)) to serve this function. The OC1BW pin is
also the output pin for the PWM mode timer function (c.f. OC1BW bit of TCCR1D reg-
ister).
XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal Oscillator or Low-frequency
crystal Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
CLKO: Divided system clock output. The divided system clock can be output on the PB5 pin.
The divided system clock will be output if the CKOUT Fuse is programmed, regardless
of the PORTB5 and DDB5 settings. It will also be output during reset.
• PCINT12/OC1AW/XTAL1/CLKI – Port B, Bit 4
PCINT12: Pin Change Interrupt, source 12.
OC1AW: Output Compare and PWM Output A-W for Timer/Counter1. The PB4 pin has to be
configured as an output (DDB4 set (one)) to serve this function. The OC1AW pin is
also the output pin for the PWM mode timer function (c.f. OC1AW bit of TCCR1D reg-
ister).
XTAL1: Chip clock Oscillator pin 1. Used for all chip clock sources except internal calibrated
RC Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
CLKI: External clock input. When used as a clock pin, the pin can not be used as an I/O pin.
Note: If PB4 is used as a clock pin (XTAL1 or CLKI), DDB4, PORTB4 and PINB4 will all read 0.
• PCINT11/OC1BV – Port B, Bit 3
PCINT11: Pin Change Interrupt, source 11.
OC1BV: Output Compare and PWM Output B-V for Timer/Counter1. The PB3 pin has to be
configured as an output (DDB3 set (one)) to serve this function. The OC1BV pin is
also the output pin for the PWM mode timer function (c.f. OC1BV bit of TCCR1D regis-
ter).
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