Datasheet

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 ATmega48A/88A/168A 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. SPH.SP10, SPMCSR.RWWSB, SPMCSR.RWWSRE and EEARH registers are only available for

ATmega88A and ATmega168A.

ATmega48A/88A/168A

Datasheet Complete

DS40002007A-page 470