AT43USB326 datasheet(45/102 Pages) ATMEL

45 / 102 page

AT43USB326

3313D–USB–04/06

Port E

Port E[0,1] are bi-directional I/O ports with open drain outputs and controlled slew rate and are

designed for use as the column drivers in a keyboard controller. The Port E[0,1] output buffers

can sink 4 mA. Port E[4:7] are bi-directional I/O with open drain outputs capable of driving

LEDs directly. Each pin of Port E[4:7] has a series resistor to limit the LEDs current.

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

ter – PORTE, $03($23), Data Direction Register – DDRE, $02($22) and the Port E Input Pins

– PINE, $01($21). The Port E Input Pin’s address is read only, while the Data Register and the

Data Direction Register are read/write.

Port E Data Register – PORTE

Port E Data Direction Register – DDRE

Port E Input Pins Address – PINE

The Port E Input Pins Address – PINE (Port E Input Pins) – is not a register, and this address

enables access to the physical value on each Port E pin. When reading PORTE the Port E

Data Latch is read, and when reading PINE, the logical values present on the pins are read.

Bit

$03($23)

PORTE7

PORTE6

PORTE5

PORTE4

–

PORTE1

PORTE0

PORTE

Read/Write

R/W

Initial Value

Bit

$02 ($22)

DDE7

DDE6

DDE5

DDE4

–

DDE1

DDE0

DDRE

Read/Write

R/W

Initial Value

Bit

$01 ($21)

PINE7

PINE6

PINE5

PINE4

–

PINE1

PINE0

PINE

Read/Write

R/W

Initial Value

N/A

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