AT43USB355 datasheet(5/115 Pages) ATMEL

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AT43USB355

2603G–USB–04/06

PD[0:7]

Bi-directional

Port D[0:7] – Bi-directional I/O ports with 2 mA drive strength and a programmable

pull-up resistor. PortD[2,3,5,6] have dual functions as shown below:

Port Pin

Alternate Function

PD2

INT0, External Interrupt 0

PD3

INT1, External Interrupt 1

PD5

OC1A Timer/Counter1 Output Compare A

PD6

OC1B Timer/Counter1 Output Compare B

PF[1:3]

Bi-directional

Port F[1:3] – Bi-directional 3-bit I/O port with 2 mA drive strength and a

programmable pull-up resistor. In the AT43USB355E, PF[1:3] pins have dual

functions as the interface pins to the serial EEPROM. After program memory

downloading is complete, PF3 has a third function as Timer/Counter1 Input

Capture, ICP.

Port Pin

Alternate Function

PF1

SCK, SPI Master Clock Out

PF2

MOSI, SPI Slave Data Input

PF3

MISO, SPI Slave Data Out. ICP after download complete

SSN/NC

Output

Slave Select – In the AT43USB355E, this pin enables the external serial memory.

In the AT43USB355M, this pin has no function and can be left floating or connected

to VCEXT.

ADC[0:11]

Input

ADC Input[0:11] – 12-bit input pins for the ADC.

AREF

Input

Analog Reference – Input for the ADC.

TEST

Input

Test Pin – This pin should be tied to ground.

RESETN

Input

Reset – Active Low.

Signal Description (Continued)

Name

Type

Function

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