Rainbow Electronics ATmega8HVD - Manual (Page 154)

154
8052B–AVR–09/08
ATmega4HVD/8HVD
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 $00 - $1F are directly bit-accessible using the SBI and CBI instructions. In these reg-
isters, 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 $00 - $3F must be used. When addressing I/O regis-
ters as data space using LD and ST instructions, $20 must be added to these addresses. The ATmega4HVD/8HVD 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 $60 - $FF in SRAM, only the ST/STS/STD and LD/LDS/LDD
instructions can be used.
0x1B (0x3B) Reserved – – – – – – – –
0x1A (0x3A) Reserved – – – – – – – –
0x19 (0x39) Reserved – – – – – – – –
0x18 (0x38) Reserved – – – – – – – –
0x17 (0x37) OSICSR – – – OSISEL0 – – OSIST OSIEN
0x16 (0x36) TIFR1 – – – – ICF1 OCF1B OCF1A TOV1
0x15 (0x35) TIFR0 – – – – ICF0 OCF0B OCF0A TOV0
0x14 (0x34) Reserved – – – – – – – –
0x13 (0x33) Reserved – – – – – – – –
0x12 (0x32) Reserved – – – – – – – –
0x11 (0x31) Reserved – – – – – – – –
0x10 (0x30) Reserved – – – – – – – –
0x0F (0x2F) Reserved – – – – – – – –
0x0E (0x2E) Reserved – – – – – – – –
0x0D (0x2D) Reserved – – – – – – – –
0x0C (0x2C) Reserved – – – – – – – –
0x0B (0x2B) Reserved – – – – – – – –
0x0A (0x2A) Reserved – – – – – – – –
0x09 (0x29) Reserved – – – – – – – –
0x08 (0x28) PORTC – – – – – – PORTC1 PORTC0
0x07 (0x27) Reserved – – – – – – – –
0x06 (0x26) PINC – – – – – – PINC1 PINC0
0x05 (0x25) PORTB – – – – – PORTB2 PORTB1 PORTB0
0x04 (0x24) DDRB – – – – – DDB2 DDB1 DDB0
0x03 (0x23) PINB – – – – – PINB2 PINB1 PINB0
0x02 (0x22) Reserved – – – – – – – –
0x01 (0x21) Reserved – – – – – – – –
0x00 (0x20) Reserved – – – – – – – –
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page