at43usb355 ATMEL Corporation, at43usb355 Datasheet - Page 5

• Manufacturer Part Number: at43usb355
• Description: At43usb355 Full-speed Usb Microcontroller With Embedded Hub, Adc And Pwm
• Manufacturer: ATMEL Corporation

Signal Description (Continued)
2603G–USB–04/06
Name
PD[0:7]
PF[1:3]
SSN/NC
ADC[0:11]
AREF
TEST
RESETN
Output
Input
Type
Bi-directional
Bi-directional
Input
Input
Input
Function
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
PD2
PD3
PD5
PD6
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
PF1
PF2
PF3
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 Input[0:11] – 12-bit input pins for the ADC.
Analog Reference – Input for the ADC.
Test Pin – This pin should be tied to ground.
Reset – Active Low.
Alternate Function
INT0, External Interrupt 0
INT1, External Interrupt 1
OC1A Timer/Counter1 Output Compare A
OC1B Timer/Counter1 Output Compare B
Alternate Function
SCK, SPI Master Clock Out
MOSI, SPI Slave Data Input
MISO, SPI Slave Data Out. ICP after download complete
AT43USB355
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