AT90USB646 datasheet(376/434 Pages) ATMEL

Part #	AT90USB646

Description	Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	434 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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376 / 434 page

376

7593A–AVR–02/06

AT90USB64/128

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 29-3 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 29-2. Addressing the Flash Which is Organized in Pages(1)

Note:

1. PCPAGE and PCWORD are listed in Table 29-11 on page 373.

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

AT90USB646 Datasheet(PDF) 376 Page - ATMEL Corporation