13.6.2 EEPROM Address Register Low and
High Byte
The EEARL and EEARH register pair represents the 16-bit value, EEAR. The low byte [7:0] (suffix L) is accessible
at the original offset. The high byte [15:8] (suffix H) can be accessed at offset +
0x01. For more details on reading and writing 16-bit registers, refer to Accessing 16-bit Registers.
When addressing I/O Registers as data space using LD
and ST instructions, the provided offset must be used. When using the I/O specific
commands IN and OUT, the offset is reduced by 0x20, resulting in an I/O address offset
within 0x00 - 0x3F.
| Name: | EEARL and EEARH |
| Offset: | 0x41 |
| Reset: | 0xXX |
| Property: | When addressing as I/O
Register: address offset is 0x21 |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| | | | | | | | EEAR[9:8] | |
| Access | | | | | | | R/W | R/W | |
| Reset | | | | | | | x | x | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| | EEAR[7:0] | |
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | x | x | x | x | x | x | x | x | |
Bits 9:0 – EEAR[9:0] EEPROM Address
The EEPROM Address
Registers – EEARH and EEARL specify the EEPROM address in the 1024 Bytes EEPROM space. The EEPROM data bytes are
addressed linearly between 0 and 1023. The initial
value of EEAR is undefined. A proper value must be written before the EEPROM may be
accessed.
