85
AT90S2313
0839G–08/01
Notes: 1. For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addresses
should never be written.
2. Some of the status flags are cleared by writing a logical “1” to them. Note that the CBI and SBI instructions will operate on all
bits in the I/O register, writing a “1” back into any flag read as set, thus clearing the flag. The CBI and SBI instructions work
with registers $00 to $1F only.
Register Summary
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
$3F ($5F) SREG I T H S V N Z C page 17
$3E ($5E) Reserved
$3D ($5D) SPL SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 page 18
$3C ($5C) Reserved
$3B ($5B) GIMSK INT1 INT0 - - - - - - page 23
$3A ($5A) GIFR INTF1 INTF0
page 23
$39 ($59) TIMSK TOIE1 OCIE1A
- - TICIE1 - TOIE0 - page 24
$38 ($58) TIFR TOV1 OCF1A
- -ICF1-TOV0- page 24
$37 ($57) Reserved
$36 ($56) Reserved
$35 ($55) MCUCR - - SE SM ISC11 ISC10 ISC01 ISC00 page 26
$34 ($54) Reserved
$33 ($53) TCCR0 - - - - - CS02 CS01 CS00 page 29
$32 ($52) TCNT0 Timer/Counter0 (8 Bits) page 30
$31 ($51) Reserved
$30 ($50) Reserved
$2F ($4F) TCCR1A COM1A1 COM1A0 - - - - PWM11 PWM10 page 31
$2E ($4E) TCCR1B ICNC1 ICES1
. - CTC1 CS12 CS11 CS10 page 32
$2D ($4D) TCNT1H Timer/Counter1 – Counter Register High Byte page 33
$2C ($4C) TCNT1L Timer/Counter1 – Counter Register Low Byte page 33
$2B ($4B) OCR1AH Timer/Counter1 – Compare Register High Byte page 34
$2A ($4A) OCR1AL Timer/Counter1 – Compare Register Low Byte page 34
$29 ($49) Reserved
$28 ($48) Reserved
$27 ($47) Reserved
$26 ($46) Reserved
$25 ($45) ICR1H Timer/Counter1 – Input Capture Register High Byte page 35
$24 ($44) ICR1L Timer/Counter1 – Input Capture Register Low Byte page 35
$23 ($43) Reserved
$22 ($42) Reserved
$21 ($41) WDTCR - - - WDTOE WDE WDP2 WDP1 WDP0 page 38
$20 ($40) Reserved
$1F ($3F) Reserved
$1E ($3E) EEAR - EEPROM Address Register page 40
$1D ($3D) EEDR EEPROM Data Register page 40
$1C ($3C) EECR
- - - - - EEMWE EEWE EERE page 40
$1B ($3B) Reserved
$1A ($3A) Reserved
$19 ($39) Reserved
$18 ($38) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 page 52
$17 ($37) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 page 52
$16 ($36) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 page 52
$15 ($35) Reserved
$14 ($34) Reserved
$13 ($33) Reserved
$12 ($32) PORTD - PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 page 58
$11 ($31) DDRD
- DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 page 58
$10 ($30) PIND
- PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 page 58
... Reserved
$0C ($2C) UDR UART I/O Data Register page 46
$0B ($2B) USR RXC TXC UDRE FE OR
- - - page 46
$0A ($2A) UCR RXCIE TXCIE UDRIE RXEN TXEN CHR9 RXB8 TXB8 page 47
$09 ($29) UBRR UART Baud Rate Register page 49
$08 ($28) ACSR ACD
- ACO ACI ACIE ACIC ACIS1 ACIS0 page 50
… Reserved
$00 ($20) Reserved
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