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AT90S2323/2343 Register Summary
Address
Name
$3F ($5F)
SREG
$3E ($5E)
Reserved
$3D ($5D)
SPL
$3C ($5C)
Reserved
$3B ($5B)
GIMSK
$3A ($5A)
GIFR
$39 ($59)
TIMSK
$38 ($58)
TIFR
$37 ($57)
Reserved
$36 ($56)
Reserved
$35 ($55)
MCUCR
$34 ($54)
MCUSR
$33 ($53)
TCCR0
$32 ($52)
TCNT0
$31 ($51)
Reserved
$30 ($50)
Reserved
$2F ($4F)
Reserved
$2E ($4E)
Reserved
$2D ($4D)
Reserved
$2C ($4C)
Reserved
$2B ($4B)
Reserved
$2A ($4A)
Reserved
$29 ($49)
Reserved
$28 ($48)
Reserved
$27 ($47)
Reserved
$26 ($46)
Reserved
$25 ($45)
Reserved
$24 ($44)
Reserved
$23 ($43)
Reserved
$22 ($42)
Reserved
$21 ($41)
WDTCR
$20 ($40)
Reserved
$1F ($3F)
Reserved
$1E ($3E)
EEAR
$1D ($3D)
EEDR
$1C ($3C)
EECR
$1B ($3B)
Reserved
$1A ($3A)
Reserved
$19 ($39)
Reserved
$18 ($38)
PORTB
$17 ($37)
DDRB
$16 ($36)
PINB
$15 ($35)
Reserved
...
Reserved
$00 ($20)
Reserved
Note:
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 one back into any flag read as set, thus clearing the flag. The CBI and SBI instructions work
with registers $00 to $1F only.
AT90S/LS2323/2343
58
Bit 7
Bit 6
Bit 5
I
T
H
SP7
SP6
SP5
-
INT0
-
-
INTF0
-
-
-
-
-
-
-
-
SE
-
-
-
-
-
-
Timer/Counter0 (8 Bits)
-
-
-
-
EEPROM Address Register
EEPROM Data Register
-
-
-
-
-
-
-
-
-
-
-
-
Bit 4
Bit 3
Bit 2
S
V
N
SP4
SP3
SP2
-
-
-
-
-
-
-
-
-
SM
-
-
-
-
-
-
-
CS02
WDTOE
WDE
WDP2
-
-
EEMWE
PORTB4
PORTB3
PORTB2
DDB4
DDB3
DDB2
PINB4
PINB3
PINB2
Bit 1
Bit 0
Page
Z
C
page 18
SP1
SP0
page 19
-
-
page 24
page 25
TOIE0
-
page 25
TOV0
-
page 25
ISC01
ISC00
page 26
EXTRF
PORF
page 23
CS01
CS00
page 29
page 30
WDP1
WDP0
page 31
page 32
page 32
EEWE
EERE
page 33
PORTB1
PORTB0
page 35
DDB1
DDB0
page 35
PINB1
PINB0
page 36
1004D–09/01
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