AT43USB355_06 datasheet(17/115 Pages) ATMEL

17 / 115 page

AT43USB355

2603G–USB–04/06

All AT43USB355 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 instruc-

tions. 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 address-

ing I/O registers 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.

USB Hub

A block diagram of the USB hardware of the AT43USB355 is shown in Figure 6. The USB hub

of the AT43USB355 has 3 downstream ports. The embedded function is permanently

attached to Port 1. Ports 2 and 3 are available as external ports. The actual number of ports

used is strictly defined by the firmware of the AT43USB355 and can vary from 0 to 2. Because

the exact configuration is defined by firmware, ports 2 and 3 may even function as perma-

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

USB Function

The embedded USB function has its own device address and has a default end-point plus 3

other programmable end-points. Two of these end-points contain their own 64-byte FIFO while

the third end-point has an 8-byte FIFO. End-points 1 - 3 can be programmed as interrupt IN or

OUT or bulk IN or OUT end-points.

$07 ($27)

ADCSR

ADC Control and Status Register

$06 ($26)

PORTF

Data Register, Port F

$05 ($25)

DDRF

Data Direction Register, Port F

$04 ($24)

PINF

Input Pins, Port F

$03 ($23)

ADCH

ADC High Byte Data Register

$02 ($22)

ADCL

ADC Low Byte Data Register

Table 5. I/O Memory Space (Continued)

I/O (SRAM)

Address

Name

Function

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