ATmega644PA datasheet(304/468 Pages) ATMEL

Part #	ATmega644PA

Description	8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash

PDF	468 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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304 / 468 page

304

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

Set DATA = Address extended high byte (0x00 - 0xFF).

Give XTAL1 a positive pulse. This loads the address high byte.

I. Program Page

Set BS2, BS1 to “00”

Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY

goes low.

Wait until RDY/BSY goes high (See Figure 26-3 on page 305 for signal waveforms).

J. Repeat B through I until the entire Flash is programmed or until all data has been

programmed.

K. End Page Programming

1. Set XA1, XA0 to “10”. This enables command loading.

Set DATA to “0000 0000”. This is the command for No Operation.

Give XTAL1 a positive pulse. This loads the command, and the internal write signals are

reset.

Figure 26-2. Addressing the Flash Which is Organized in Pages

(1)

Note:

1. PCPAGE and PCWORD are listed in Table 26-7 on page 299.

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

ATmega644PA Datasheet(PDF) 304 Page - ATMEL Corporation