AT90USB646 datasheet(89/435 Pages) ATMEL

89 / 435 page

7593D–AVR–07/06

AT90USB64/128

10.3.6

Alternate Functions of Port E

The Port E pins with alternate functions are shown in Table 10-15.

• INT7/AIN.1/UVCON – Port E, Bit 7

INT7, External Interrupt source 7: The PE7 pin can serve as an external interrupt source.

AIN1 – Analog Comparator Negative input. This pin is directly connected to the negative input of

the Analog Comparator.

UVCON - When using USB host mode, this pin allows to control an external VBUS generator

(active high).

• INT6/AIN.0 – Port E, Bit 6

INT6, External Interrupt source 6: The PE6 pin can serve as an external interrupt source.

AIN0 – Analog Comparator Negative input. This pin is directly connected to the negative input of

the Analog Comparator.

• INT5/TOSC2 – Port E, Bit 5

INT5, External Interrupt source 5: The PE5 pin can serve as an External Interrupt source.

TOSC2, Timer/Counter2 Oscillator pin1. When the AS2 bit in ASSR is set to enable asynchro-

nous clocking of Timer/Counter2, pin PE5 is disconnected from the port, and becomes the ouput

of the inverting Oscillator amplifier. In this mode, a crystal is connected to this pin, and the pin

can not be used as an I/O pin.

• INT4/TOSC1 – Port E, Bit 4

INT4, External Interrupt source 4: The PE4 pin can serve as an External Interrupt source.

TOSC1, Timer/Counter2 Oscillator pin2. When the AS2 bit in ASSR is set to enable asynchro-

nous clocking of Timer/Counter2, pin PE4 is disconnected from the port, and becomes the input

of the inverting Oscillator amplifier. In this mode, a crystal is connected to this pin, and the pin

can not be used as an I/O pin.

• UID – Port E, Bit 3

ID pin of the USB bus.

• ALE/HWB – Port E, Bit 2

Table 10-15. Port E Pins Alternate Functions

Port Pin

Alternate Function

PE7

INT7/AIN.1/UVCON (External Interrupt 7 Input, Analog Comparator Positive Input

or VBUS Control)

PE6

INT6/AIN.0 (External Interrupt 6 Input or Analog Comparator Positive Input)

PE5

INT5/TOSC2 (External Interrupt 5 Input or RTC Oscillator Timer/Counter2))

PE4

INT4/TOSC2 (External Interrupt4 Input or RTC Oscillator Timer/Counter2)

PE3

UID

PE2

ALE/HWB (Address latch to extenal memory or Hardware bootloader activation)

PE1

RD (Read strobe to external memory)

PE0

WR (Write strobe to external memory)

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