ATmega128
Register Summary (Continued)
Address
($61)
($60)
$3F ($5F)
$3E ($5E)
$3D ($5D)
$3C ($5C)
$3B ($5B)
$3A ($5A)
$39 ($59)
$38 ($58)
$37 ($57)
$36 ($56)
$35 ($55)
$34 ($54)
$33 ($53)
Name
DDRF
Reserved
SREG
SPH
SPL
XDIV
RAMPZ
EICRB
EIMSK
EIFR
TIMSK
TIFR
MCUCR
MCUCSR
TCCR0
Bit 7
DDF7
I
SP15
SP7
XDIVEN
ISC71
INT7
INTF7
OCIE2
OCF2
SRE
JTD
FOC0
Bit 6
DDF6
T
SP14
SP6
XDIV6
ISC70
INT6
INTF6
TOIE2
TOV2
SR W 10
W GM00
Bit 5
DDF5
H
SP13
SP5
XDIV5
ISC61
INT5
INTF5
TICIE1
ICF1
SE
COM01
Bit 4
DDF4
S
SP12
SP4
XDIV4
ISC60
INT4
INTF4
OCIE1A
OCF1A
SM1
JTRF
COM00
Bit 3
DDF3
V
SP11
SP3
XDIV3
ISC51
INT3
INTF3
OCIE1B
OCF1B
SM0
W DRF
W GM01
Bit 2
DDF2
N
SP10
SP2
XDIV2
ISC50
INT2
INTF
TOIE1
TOV1
SM2
BORF
CS02
Bit 1
DDF1
Z
SP9
SP1
XDIV1
ISC41
INT1
INTF1
OCIE0
OCF0
IVSEL
EXTRF
CS01
Bit 0
DDF0
C
SP8
SP0
XDIV0
RAMPZ0
ISC40
INT0
INTF0
TOIE0
TOV0
IVCE
PORF
CS00
Page
88
10
13
13
36
13
90
91
91
108, 138, 158
108, 140, 159
30, 44, 63
53, 254
103
$32 ($52)
$31 ($51)
TCNT0
OCR0
Timer/Counter0 (8 Bit)
Timer/Counter0 Output Compare Register
105
105
$30 ($50)
$2F ($4F)
$2E ($4E)
ASSR
TCCR1A
TCCR1B
COM1A1
ICNC1
COM1A0
ICES1
COM1B1
COM1B0
W GM13
AS0
COM1C1
W GM12
TCN0UB
COM1C0
CS12
OCR0UB
W GM11
CS11
TCR0UB
W GM10
CS10
106
132
135
$2D ($4D)
$2C ($4C)
$2B ($4B)
$2A ($4A)
$29 ($49)
$28 ($48)
$27 ($47)
$26 ($46)
TCNT1H
TCNT1L
OCR1AH
OCR1AL
OCR1BH
OCR1BL
ICR1H
ICR1L
Timer/Counter1 – Counter Register High Byte
Timer/Counter1 – Counter Register Low Byte
Timer/Counter1 – Output Compare Register A High Byte
Timer/Counter1 – Output Compare Register A Low Byte
Timer/Counter1 – Output Compare Register B High Byte
Timer/Counter1 – Output Compare Register B Low Byte
Timer/Counter1 – Input Capture Register High Byte
Timer/Counter1 – Input Capture Register Low Byte
137
137
137
137
137
137
138
138
$25 ($45)
TCCR2
FOC2
W GM20
COM21
COM20
W GM21
CS22
CS21
CS20
156
$24 ($44)
$23 ($43)
TCNT2
OCR2
Timer/Counter2 (8 Bit)
Timer/Counter2 Output Compare Register
158
158
$22 ($42)
$21 ($41)
$20 ($40)
OCDR
W DTCR
SFIOR
IDRD/OCDR7
TSM
OCDR6
OCDR5
OCDR4
W DCE
OCDR3
W DE
ACME
OCDR2
W DP2
PUD
OCDR1
W DP1
PSR0
OCDR0
W DP0
PSR321
251
55
72, 109, 144, 227
$1F ($3F)
EEARH
EEPROM Address Register High
20
$1E ($3E)
$1D ($3D)
EEARL
EEDR
EEPROM Address Register Low Byte
EEPROM Data Register
20
21
$1C ($3C)
$1B ($3B)
$1A ($3A)
$19 ($39)
$18 ($38)
$17 ($37)
$16 ($36)
$15 ($35)
$14 ($34)
$13 ($33)
$12 ($32)
$11 ($31)
$10 ($30)
EECR
PORTA
DDRA
PINA
PORTB
DDRB
PINB
PORTC
DDRC
PINC
PORTD
DDRD
PIND
PORTA7
DDA7
PINA7
PORTB7
DDB7
PINB7
PORTC7
DDC7
PINC7
PORTD7
DDD7
PIND7
PORTA6
DDA6
PINA6
PORTB6
DDB6
PINB6
PORTC6
DDC6
PINC6
PORTD6
DDD6
PIND6
PORTA5
DDA5
PINA5
PORTB5
DDB5
PINB5
PORTC5
DDC5
PINC5
PORTD5
DDD5
PIND5
PORTA4
DDA4
PINA4
PORTB4
DDB4
PINB4
PORTC4
DDC4
PINC4
PORTD4
DDD4
PIND4
EERIE
PORTA3
DDA3
PINA3
PORTB3
DDB3
PINB3
PORTC3
DDC3
PINC3
PORTD3
DDD3
PIND3
EEM W E
PORTA2
DDA2
PINA2
PORTB2
DDB2
PINB2
PORTC2
DDC2
PINC2
PORTD2
DDD2
PIND2
EE W E
PORTA1
DDA1
PINA1
PORTB1
DDB1
PINB1
PORTC1
DDC1
PINC1
PORTD1
DDD1
PIND1
EERE
PORTA0
DDA0
PINA0
PORTB0
DDB0
PINB0
PORTC0
DDC0
PINC0
PORTD0
DDD0
PIND0
21
86
86
86
86
86
86
86
86
87
87
87
87
$0F ($2F)
SPDR
SPI Data Register
168
$0E ($2E)
$0D ($2D)
SPSR
SPCR
SPIF
SPIE
W COL
SPE
DORD
MSTR
CPOL
CPHA
SPR1
SPI2X
SPR0
168
166
$0C ($2C)
UDR0
USART0 I/O Data Register
188
$0B ($2B)
$0A ($2A)
UCSR0A
UCSR0B
RXC0
RXCIE0
TXC0
TXCIE0
UDRE0
UDRIE0
FE0
RXEN0
DOR0
TXEN0
UPE0
UCSZ02
U2X0
RXB80
MPCM0
TXB80
188
189
$09 ($29)
UBRR0L
USART0 Baud Rate Register Low
191
$08 ($28)
$07 ($27)
$06 ($26)
ACSR
ADMUX
ADCSRA
ACD
REFS1
ADEN
ACBG
REFS0
ADSC
ACO
ADLAR
ADFR
ACI
MUX4
ADIF
ACIE
MUX3
ADIE
ACIC
MUX2
ADPS2
ACIS1
MUX1
ADPS1
ACIS0
MUX0
ADPS0
227
242
244
$05 ($25)
$04 ($24)
ADCH
ADCL
ADC Data Register High Byte
ADC Data Register Low Byte
245
245
$03 ($23)
$02 ($22)
PORTE
DDRE
PORTE7
DDE7
PORTE6
DDE6
PORTE5
DDE5
PORTE4
DDE4
PORTE3
DDE3
PORTE2
DDE2
PORTE1
DDE1
PORTE0
DDE0
87
87
363
2467X–AVR–06/11
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