ATmega64A datasheet(303/392 Pages) ATMEL

303 / 392 page

303

8160C–AVR–07/09

ATmega64A

Figure 27-2. Addressing the Flash which is Organized in Pages

(1)

Note:

1. PCPAGE and PCWORD are listed in

Table 27-9 on page 300.

Figure 27-3. Programming the Flash Waveforms(1)

Note:

1. “XX” is don’t care. The letters refer to the programming description above.

27.6.5

Programming the EEPROM

The EEPROM is organized in pages, see Table 27-10 on page 300. When programming the

EEPROM, the program data is latched into a page buffer. This allows one page of data to be

programmed simultaneously. The programming algorithm for the EEPROM data memory is as

follows (refer to “Programming the Flash” on page 301 for details on Command, Address and

Data loading):

PROGRAM MEMORY

WORD ADDRESS

WITHIN A PAGE

PAGE ADDRESS

WITHIN THE FLASH

INSTRUCTION WORD

PAGE

PCWORD[PAGEMSB:0]:

PAGEEND

PAGE

PCWORD

PCPAGE

PCMSB

PAGEMSB

PROGRAM

COUNTER

RDY/BSY

RESET +12V

PAGEL

BS2

$10

ADDR. LOW

ADDR. HIGH

DATA

DATA LOW

DATA HIGH

ADDR. LOW

DATA LOW

DATA HIGH

XA1

XA0

BS1

XTAL1

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