AT43USB355 datasheet(66/115 Pages) ATMEL

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AT43USB355

2603G–USB–04/06

ADC Characteristics

I/O-Ports

All AVR ports have true Read-Modify-Write functionality when used as general digital I/O

ports. This means that the direction of one port pin can be changed without unintentionally

changing the direction of any other pin with the SBI and CBI instructions. The same applies for

changing drive value if configured as output or enabling/disabling of pull-up resistors if config-

ured as input.

In the AT43USB355E, Port F[0:4] are used as the SPI signals for the external serial EEPROM.

Once the data from the SEEPROM are loaded to the SRAM, Port F[1:3] become available as

GPIO pins. Only cycling the power to the chip off and on again will temporarily assign these

pins as SEEPROM interface signals.

Port A

Port A is an 8-bit bi-directional I/O port. The Port A output buffers can sink or source 2 mA.

Three I/O memory address locations are allocated for the Port A, one each for the Data Regis-

ter PORTA, $1B($3B), Data Direction Register (DDRA), $1A($3A) and the Port A Input Pins

(PINA) $19($39). The Port A Input Pins address is read only, while the Data Register and the

Data Direction Register are read/write.

All port pins have individually selectable pull-up resistors. When pins PA0 to PA7 are used as

inputs and are externally pulled low, they will source current if the internal pull-up resistors are

activated.

Symbol

Parameter

Condition

Min

Typ

Max

Unit

Resolution

Bits

Integral Non-linearity

VREF = VCEXTA

LSB

Differential Non-linearity

VREF = VCEXTA

LSB

Zero Error (Offset)

-2

LSB

Full Scale Error

-4

LSB

VREF

Reference Voltage

2.4

VCEXTA

REF input resistance

°C12

Ω

Analog Input Resistance

100

Ω

Conversion Time

768

µs

Clock Frequency

at 50% duty cycle

MHz

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