ATmega16 datasheet(261/315 Pages) ATMEL

261 / 315 page

261

ATmega16(L)

2466E–AVR–10/02

While the lower bits in the address are mapped to words within the page, the higher bits

address the pages within the FLASH. This is illustrated in Figure 128 on page 261. Note

that if less than 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 per-

forming 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 129 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 sig-

nals are reset.

Figure 128. Addressing the Flash which is Organized in Pages

Note:

1. PCPAGE and PCWORD are listed in

Table 110 on page 258.

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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