Microchip Microcontroller ATmega64 Heximal Extraction will need to break atmega64 mcu security fuse bit, and then restore embedded firmware from atmega64 microprocessor flash memory;
For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addresses should never be written.
I/O Registers within the address range 0x00 – 0x1F are directly bit-accessible using the SBI and CBI In these registers, the value of single bits can be checked by using the SBIS and SBIC instructions.
Some of the Status Flags are cleared by writing a logical one to them. Note that, unlike most other AVRs, the CBI and SBI instructions will only operate on the specified bit, and can therefore be used on registers containing such Status The CBI and SBI instructions work with registers 0x00 to 0x1F only.
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 to readout atmega64 mcu firmware file, 0x20 must be added to these The ATmega165P 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.
The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro- gram running on the AVR core.
The Boot program can use any interface to download the application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip when extracting atmega8515 ic chip firmware, the Atmel ATmega165P is a powerful microcontroller that provides a highly flex- ible and cost effective solution to many embedded control applications.
