ATmega16U2 datasheet(254/314 Pages) ATMEL

No. de pieza	ATmega16U2

Descripción Electrónicos	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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254 / 314 page

254

7799B–AVR–07/09

ATmega8U2/16U2/32U2

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

Set BS2, BS1 to “10”. This selects the address extended high byte.

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 25-3 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 25-2. Addressing the Flash Which is Organized in Pages

(1)

Note:

1. PCPAGE and PCWORD are listed in Table 25-7 on page 249.

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

ATmega16U2 Datasheet(PDF) 254 Page - ATMEL Corporation