AT43USB325 datasheet(18/109 Pages) ATMEL

18 / 109 page

3355C–USB–4/05

AT43USB325

All AT43USB325 I/O and peripherals, except for the USB hardware registers, are placed in the

I/O space. The I/O locations are accessed by the IN and OUT instructions transferring data

between the 32 general-purpose working registers and the I/O space. I/O registers within the

address range $00 – $1F are directly bit-accessible using the SBI and CBI instructions. In these

registers, the value of single bits can be checked by using the SBIS and SBIC instructions. Refer

to the instruction set documentations of the AVR for more details. When using the I/O specific

commands, IN and OUT, the I/O address $00 – $3F must be used. When addressing I/O regis-

ters as SRAM, $20 must be added to this address. All I/O register addresses throughout this

document are shown with the SRAM address in parentheses.

For compatibility with future devices, reserved bits should be written to zero if accessed.

Reserved I/O memory addresses should never be written.

3.7

USB Hub

A block diagram of the USB hardware of the AT43USB325 is shown in Figure 3-3. The USB hub

of the AT43USB325 has 5 downstream ports. The embedded function is permanently attached

to Port 1. Ports 2, 3, 4 and 5 are available as external ports. The actual number of ports used is

strictly defined by the firmware of the AT43USB325 and can vary from 0 to 4. Because the exact

configuration is defined by firmware, these ports may even function as permanently attached

ports as long as the Hub Descriptor identifies them as such.

3.7.1

USB Function

The embedded USB function has its own device address and has a default endpoint plus 3 other

programmable endpoints with their own 8-byte FIFOs. Endpoints 1 and 2 can be programmed

as interrupt IN or OUT or bulk IN or OUT endpoints.

$15 ($35)

PORTC

Data Register, Port C

$14 ($34)

DDRC

Data Direction Register, Port C

$13 ($33)

PINC

Input Pins, Port C

$12 ($32)

PORTD

Data Register, Port D

$11 ($31)

DDRD

Data Direction Register, Port D

$10 ($30)

PIND

Input Pins, Port D

$06 ($26)

PORTF

Data Register, Port F

$05 ($25)

DDRF

Data Direction Register, Port F

$04 ($24)

PINF

Input Pins, Port F

$03 ($23)

PORTE

Data Register, Port E

$02 ($22)

DDRE

Data Direction Register, Port E

$01 ($21)

PINE

Input Pins, Port E

Table 3-5.

I/O Memory Space (Continued)

I/O (SRAM)

Address

Name

Function

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