ATmega32A datasheet(273/352 Pages) ATMEL

273 / 352 page

273

8155B–AVR–07/09

ATmega32A

8 bits are required to address words in the page (pagesize < 256), the most significant bit(s) in

the address low byte are used to address the page when performing a page write.

G. Load Address High byte

Set XA1, XA0 to “00”. This enables address loading.

Set BS1 to “1”. This selects high address.

Set DATA = Address high byte ($00 - $FF).

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

H. Program Page

Set BS1 = “0”

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

RDY/BSYgoes low.

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

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

programmed.

J. 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

Note:

1. PCPAGE and PCWORD are listed in

Table 26-5 on page 269.

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

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