Datasheet
ATmega48/88/168 Automotive [DATASHEET]
7530K–AVR–07/14
286
(0xDE) Reserved – – – – – – – –
(0xDD) Reserved
– – – – – – – –
(0xDC) Reserved
– – – – – – – –
(0xDB) Reserved
– – – – – – – –
(0xDA) Reserved
– – – – – – – –
(0xD9) Reserved
– – – – – – – –
(0xD8) Reserved
– – – – – – – –
(0xD7) Reserved
– – – – – – – –
(0xD6) Reserved
– – – – – – – –
(0xD5) Reserved
– – – – – – – –
(0xD4) Reserved
– – – – – – – –
(0xD3) Reserved
– – – – – – – –
(0xD2) Reserved
– – – – – – – –
(0xD1) Reserved
– – – – – – – –
(0xD0) Reserved
– – – – – – – –
(0xCF) Reserved
– – – – – – – –
(0xCE) Reserved
– – – – – – – –
(0xCD) Reserved
– – – – – – – –
(0xCC) Reserved
– – – – – – – –
(0xCB) Reserved
– – – – – – – –
(0xCA) Reserved
– – – – – – – –
(0xC9) Reserved
– – – – – – – –
(0xC8) Reserved
– – – – – – – –
(0xC7) Reserved
– – – – – – – –
(0xC6) UDR0 USART I/O data register 161
(0xC5) UBRR0H
USART baud rate register high 164
(0xC4) UBRR0L USART Baud Rate Register Low 164
(0xC3) Reserved
– – – – – – – –
(0xC2) UCSR0C UMSEL01 UMSEL00 UPM01 UPM00 USBS0
UCSZ01
/UDORD0
UCSZ00 /
UCPHA0
UCPOL0 163/173
(0xC1) UCSR0B RXCIE0 TXCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80 162
(0xC0) UCSR0A RXC0 TXC0 UDRE0 FE0 DOR0 UPE0 U2X0 MPCM0 161
(0xBF) Reserved – – – – – – – –
(0xBE) Reserved
– – – – – – – –
29. Register Summary (Continued)
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
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. 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, unlike most other AVR
®
, the CBI and
SBI instructions will only operate on the specified bit, and can therefore be used on registers containing such status
flags. 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
ATmega48/88/168 is a complex microcontroller with more peripheral units than can be supported within the 64 location
reserved in opcode for the IN and OUT instructions. For the extended I/O space from 0x60 - 0xFF in SRAM, only the
ST/STS/STD and LD/LDS/LDD instructions can be used.
5. Only valid for Atmel
®
ATmega88/168