ATMEGA48V_06 ATMEL [ATMEL Corporation], ATMEGA48V_06 Datasheet - Page 17

• Manufacturer Part Number: ATMEGA48V_06
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

6. AVR Memories
6.1
6.2
2545J–AVR–12/06
Overview
In-System Reprogrammable Flash Program Memory
This section describes the different memories in the ATmega48/88/168. The AVR architecture
has two main memory spaces, the Data Memory and the Program Memory space. In addition,
the ATmega48/88/168 features an EEPROM Memory for data storage. All three memory spaces
are linear and regular.
The ATmega48/88/168 contains 4/8/16K 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 2/4/8K x 16. For software security, the Flash Program memory space is divided into two
sections, Boot Loader Section and Application Program Section in ATmega88 and ATmega168.
ATmega48 does not have separate Boot Loader and Application Program sections, and the
SPM instruction can be executed from the entire Flash. See SELFPRGEN description in section
”SPMCSR – Store Program Memory Control and Status Register” on page 267
more details.
The Flash memory has an endurance of at least 10,000 write/erase cycles. The
ATmega48/88/168 Program Counter (PC) is 11/12/13 bits wide, thus addressing the 2/4/8K pro-
gram memory locations. The operation of Boot Program section and associated Boot Lock bits
for software protection are described in detail in
page 262
ATmega168” on page
on Flash Programming in SPI- 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
ing” on page
and
14.
”Boot Loader Support – Read-While-Write Self-Programming, ATmega88 and
269.
”Memory Programming” on page 285
”Self-Programming the Flash, ATmega48” on
ATmega48/88/168
contains a detailed description
”Instruction Execution Tim-
and
page
283for
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