ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 16

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

AVR ATmega64
Memories
In-System
Reprogrammable Flash
Program Memory
16
ATmega64(L)
This section describes the different memories in the ATmega64. The AVR architecture
has two main memory spaces, the Data Memory and the Program Memory space. In
addition, the ATmega64 features an EEPROM Memory for data storage. All three mem-
ory spaces are linear and regular.
The ATmega64 contains 64K bytes On-chip In-System Reprogrammable Flash memory
for program storage. Since all AVR instructions are 16 or 32 bits wide, the Flash is orga-
nized as 32K x 16. For software security, the Flash Program memory space is divided
into two sections, Boot Program section and Application Program section.
The Flash memory has an endurance of at least 10,000 write/erase cycles. The
ATmega64 Program Counter (PC) is 15 bits wide, thus addressing the 32K program
memory locations. The operation of Boot Program section and associated Boot Lock
bits for software protection are described in detail in “Boot Loader Support – Read-
While-Write Self-programming” on page 277. “Memory Programming” on page 290 con-
tains a detailed description on Flash programming in SPI, JTAG, or Parallel
Programming mode.
Constant tables can be allocated within the entire program memory address space (see
the LPM – Load Program Memory instruction description).
Timing diagrams for instruction fetch and execution are presented in “Instruction Execu-
tion Timing” on page 13.
Figure 8. Program Memory Map
Application Flash Section
Boot Flash Section
$0000
$7FFF
2490G–AVR–03/04