I/o memory – Rainbow Electronics AT90LS8535 User Manual

Page 17

AT90S/LS8535

1041H–11/01

I/O Memory

The I/O space definition of the AT90S8535 is shown in Table 1.

Table 1. AT90S8535 I/O Space

I/O Address

(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 Flag register

$35 ($55)

MCUCR

MCU general Control Register

$34 ($45)

MCUSR

MCU general Status Register

$33 ($53)

TCCR0

Timer/Counter0 Control Register

$32 ($52)

TCNT0

Timer/Counter0 (8-bit)

$2F ($4F)

TCCR1A

Timer/Counter1 Control Register A

$2E ($4E)

TCCR1B

Timer/Counter1 Control Register B

$2D ($4D)

TCNT1H

Timer/Counter1 High Byte

$2C ($4C)

TCNT1L

Timer/Counter1 Low Byte

$2B ($4B)

OCR1AH

Timer/Counter1 Output Compare Register A High Byte

$2A ($4A)

OCR1AL

Timer/Counter1 Output Compare Register A Low Byte

$29 ($49)

OCR1BH

Timer/Counter1 Output Compare Register B High Byte

$28 ($48)

OCR1BL

Timer/Counter1 Output Compare Register B Low Byte

$27 ($47)

ICR1H

T/C 1 Input Capture Register High Byte

$26 ($46)

ICR1L

T/C 1 Input Capture Register Low Byte

$25 ($45)

TCCR2

Timer/Counter2 Control Register

$24 ($44)

TCNT2

Timer/Counter2 (8-bit)

$23 ($43)

OCR2

Timer/Counter2 Output Compare Register

$22 ($42)

ASSR

Asynchronous Mode Status Register

$21 ($41)

WDTCR

Watchdog Timer Control Register

$1F ($3E)

EEARH

EEPROM Address Register High Byte

$1E ($3E)

EEARL

EEPROM Address Register Low Byte

$1D ($3D)

EEDR

EEPROM Data Register

$1C ($3C)

EECR

EEPROM Control Register

$1B ($3B)

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