
ATmega603/103
19
I/O Memory
The I/O space definition of the ATmega603/103 is shown in the following table:
Table 3. ATmega603/103 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
$3C ($5C) XDIV XTAL Divide Control Register
$3B ($5B) RAMPZ RAM Page Z Select Register
$3A ($5A) EICR External Interrupt Control Register
$39 ($59) EIMSK External Interrupt MaSK register
$38 ($58) EIFR External Interrupt Flag Register
$37 ($57) TIMSK Timer/Counter Interrupt MaSK register
$36 ($56) TIFR Timer/Counter Interrupt Flag register
$35 ($55) MCUCR MCU General Control Register
$34 ($54) MCUSR MCU Status Register
$33 ($53) TCCR0 Timer/Counter0 Control Register
$32 ($52) TCNT0 Timer/Counter0 (8-bit)
$31 ($51) OCR0 Timer/Counter0 Output Compare Register
$30 ($50) ASSR Asynchronous Mode Status Register
$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 Timer/Counter1 Input Capture Register High Byte
$26 ($46) ICR1L Timer/Counter1 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
$21 ($41) WDTCR Watchdog Timer Control Register
$1F ($3F) EEARH EEPROM Address Register High
$1E ($3E) EEARL EERPOM Address Register Low
$1D ($3D) EEDR EEPROM Data Register
$1C ($3C) EECR EEPROM Control Register
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