AT43USB355_06 datasheet(68/115 Pages) ATMEL

номер детали	AT43USB355

подробное описание детали	Full-speed USB Microcontroller with Embedded Hub, ADC and PWM

PDF	115 Pages

Scroll/Zoom	100%

производитель	ATMEL [ATMEL Corporation]

домашняя страница	http://www.atmel.com

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68 / 115 page

AT43USB355

2603G–USB–04/06

Port B

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

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

ter - PORTB, $18($38), Data Direction Register (DDRB), $17($37) and the Port B Input Pins

(PINB), $16($36). The Port B 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 PB0 to PB7 are used as

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

activated

The Port B pins with alternate functions are shown in the following table:

When the pins are used for the alternate function the DDRB and PORTB register has to be set

according to the alternate function description.

Table 25. Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB0

T0 (Timer/Counter 0 External Counter Input)

PB1

T1 (Timer/Counter 1 External Counter Input)

PB4

SS (SPI Slave Select Input)

PB5

MOSI (SPI Bus Master Output/Slave Input)

PB6

MISO (SPI Bus Master Input/Slave Output)

PB7

SCK (SPI Bus Serial Clock)

AT43USB355 датащи(PDF) 68 Page - ATMEL Corporation