To Next Page

To Previous Page

AT90S4414/8515

I/O Memory

The I/O space definition of the AT90S4414/8515 is shown in the following table:

Table 2. AT90S4414/8515 I/O Space

Address Hex 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

$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

$25 ($45) ICR1H T/C 1 Input Capture Register High Byte

$24 ($44) ICR1L T/C 1 Input Capture Register Low Byte

$21 ($41) WDTCR Watchdog Timer Control Register

$1F ($3E) EEARH EEPROM Address Register High Byte (AT90S8515)

$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

$17 ($37) DDRB Data Direction Register, Port B

$16 ($36) PINB Input Pins, Port B

$15 ($35) PORTC Data Register, Port C

$14 ($34) DDRC Data Direction Register, Port C

$13 ($33) PINC Input Pins, Port C

Atmel AT90S8515-8PI User Manual

Questions and Answers: