AT43USB326 datasheet(14/102 Pages) ATMEL

14 / 102 page

AT43USB326

3313D–USB–04/06

I/O Memory

The I/O space definition of the AT43USB326 is shown in the following table:

All AT43USB326 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.

Table 5. I/O Memory Space

I/O (SRAM)

Address

Name

Function

$3F ($5F)

SREG

Status Register

$3E ($5E)

SPH

Stack Pointer High

$3D ($5D)

SPL

Stack Pointer Low

$3B ($5B)

GIMSK

General Interrupt Mask Register

$3A ($5A)

GIFR

General Interrupt Flag Register

$39 ($59)

TIMSK

Timer/Counter Interrupt Mask Register

$38 ($58)

TIFR

Timer/Counter Interrupt Mask Register

$35 ($55)

MCUCR

MCU General Control Register

$33 ($53)

TCCR0

Timer/Counter0 Control Register

$32 ($52)

TCNT0

Timer/Counter0 (8 bit)

$21 ($41)

WDTCR

Watchdog Timer Counter Register

$1B ($4B)

PORTA

Data Register, Port A

$1A ($3A)

DDRA

Data Direction Register, Port A

$19 ($39)

PINA

Input Pins, Port A

$18 ($38)

PORTB

Data Register, Port B

$17 ($37)

DDRB

Data Direction Register, Port B

$16 ($36)

PINB

Input Pins, Port B

$12 ($32)

PORTD

Data Register, Port D

$11 ($31)

DDRD

Data Direction Register, Port D

$10 ($30)

PIND

Input Pins, Port D

$03 ($23)

PORTE

Data Register, Port E

$02 ($22)

DDRE

Data Direction Register, Port E

$01 ($21)

PINE

Input Pins, Port E

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