
500
8266A-MCU Wireless-12/09
Address
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
... Reserved
0x2E (0x4E)
SPDR SPDR7 SPDR6 SPDR5 SPDR4 SPDR3 SPDR2 SPDR1 SPDR0 338
0x2D (0x4D)
SPSR SPIF WCOL Res4 Res3 Res2 Res1 Res0 SPI2X 337
0x2C (0x4C)
SPCR SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 336
0x2B (0x4B)
GPIOR2 GPIOR27 GPIOR26 GPIOR25 GPIOR24 GPIOR23 GPIOR22 GPIOR21 GPIOR20 26
0x2A (0x4A)
GPIOR1 GPIOR17 GPIOR16 GPIOR15 GPIOR14 GPIOR13 GPIOR12 GPIOR11 GPIOR10 26
... Reserved
0x28 (0x48)
OCR0B OCR0B_7 OCR0B_6 OCR0B_5 OCR0B_4 OCR0B_3 OCR0B_2 OCR0B_1 OCR0B_0 242
0x27 (0x47)
OCR0A OCR0A_7 OCR0A_6 OCR0A_5 OCR0A_4 OCR0A_3 OCR0A_2 OCR0A_1 OCR0A_0 241
0x26 (0x46)
TCNT0 TCNT0_7 TCNT0_6 TCNT0_5 TCNT0_4 TCNT0_3 TCNT0_2 TCNT0_1 TCNT0_0 241
0x25 (0x45)
TCCR0B FOC0A FOC0B Res1 Res0 WGM02 CS02 CS01 CS00 240
0x24 (0x44)
TCCR0A COM0A1 COM0A0 COM0B1 COM0B0 Res1 Res0 WGM01 WGM00 238
0x23 (0x43)
GTCCR TSM Res4 Res3 Res2 Res1 Res0 PSRASY PSRSYNC 329
0x22 (0x42)
EEARH Res3 Res2 Res1 Res0 EEAR11 EEAR10 EEAR9 EEAR8 23
0x21 (0x41)
EEARL EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 23
0x20 (0x40)
EEDR EEDR7 EEDR6 EEDR5 EEDR4 EEDR3 EEDR2 EEDR1 EEDR0 23
0x1F (0x3F)
EECR Res1 Res0 EEPM1 EEPM0 EERIE EEMPE EEPE EERE 24
0x1E (0x3E)
GPIOR0 GPIOR07 GPIOR06 GPIOR05 GPIOR04 GPIOR03 GPIOR02 GPIOR01 GPIOR00 26
0x1D (0x3D)
EIMSK INT7 INT6 INT5 INT4 INT3 INT2 INT1 INT0 222
0x1C (0x3C)
EIFR INTF7 INTF6 INTF5 INTF4 INTF3 INTF2 INTF1 INTF0 222
0x1B (0x3B)
PCIFR Res4 Res3 Res2 Res1 Res0 PCIF2 PCIF1 PCIF0 223
0x1A (0x3A)
TIFR5 Res1 Res0 ICF5 Res OCF5C OCF5B OCF5A TOV5 302
0x19 (0x39)
TIFR4 Res1 Res0 ICF4 Res OCF4C OCF4B OCF4A TOV4 293
0x18 (0x38)
TIFR3 Res1 Res0 ICF3 Res OCF3C OCF3B OCF3A TOV3 284
0x17 (0x37)
TIFR2 Res4 Res3 Res2 Res1 Res0 OCF2B OCF2A TOV2 324
0x16 (0x36)
TIFR1 Res1 Res0 ICF1 Res OCF1C OCF1B OCF1A TOV1 275
0x15 (0x35)
TIFR0 Res4 Res3 Res2 Res1 Res0 OCF0B OCF0A TOV0 243
0x14 (0x34)
PORTG Res1 Res0 PORTG5 PORTG4 PORTG3 PORTG2 PORTG1 PORTG0 209
0x13 (0x33)
DDRG Res1 Res0 DDG5 DDG4 DDG3 DDG2 DDG1 DDG0 209
0x12 (0x32)
PING Res1 Res0 PING5 PING4 PING3 PING2 PING1 PING0 210
0x11 (0x31)
PORTF PORTF7 PORTF6 PORTF5 PORTF4 PORTF3 PORTF2 PORTF1 PORTF0 208
0x10 (0x30)
DDRF DDF7 DDF6 DDF5 DDF4 DDF3 DDF2 DDF1 DDF0 208
0x0F (0x2F)
PINF PINF7 PINF6 PINF5 PINF4 PINF3 PINF2 PINF1 PINF0 209
0x0E (0x2E)
PORTE PORTE7 PORTE6 PORTE5 PORTE4 PORTE3 PORTE2 PORTE1 PORTE0 207
0x0D (0x2D)
DDRE DDE7 DDE6 DDE5 DDE4 DDE3 DDE2 DDE1 DDE0 207
0x0C (0x2C)
PINE PINE7 PINE6 PINE5 PINE4 PINE3 PINE2 PINE1 PINE0 208
0x0B (0x2B)
PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 206
0x0A (0x2A)
DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 207
0x09 (0x29)
PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 207
0x08 (0x28)
PORTC PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 27
0x07 (0x27)
DDRC DDC7 DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 28
0x06 (0x26)
PINC PINC7 PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 28
0x05 (0x25)
PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 205
0x04 (0x24)
DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 206
0x03 (0x23)
PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 206
0x02 (0x22)
PORTA PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 27
0x01 (0x21)
DDRA DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 27
0x00 (0x20)
PINA PINA7 PINA6 PINA5 PINA4 PINA3 PINA2 PINA1 PINA0 27
Notes: 1. Reserved registers, bits and I/O memory addresses (marked as Res*) may not be modified.
2. I/O registers within the address range 0x00 - 0x1F are directly bit-accessible using the SBI and CBI instructions. In these registers, the
value of single bits can be checked by using the SBIS and SBIC instructions.
3. Some of the status flags are cleared by writing a logical one 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 0x00 to
0x1F only.
4. When using the I/O specific commands IN and OUT, the I/O addresses 0x00 – 0x3F must be used. When addressing I/O registers as
data space using LD and ST instructions, 0x20 must be added to these addresses. The device is a complex microcontroller with more
peripheral units than can be supported within the 64 location reserved in Op-code for the IN and OUT instructions. For the Extended I/O
space from 0x60 – 0x1FF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
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