ATmega16U4 datasheet(356/408 Pages) ATMEL

Part #	ATmega16U4

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

PDF	408 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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356 / 408 page

356

7766D–AVR–01/09

ATmega16U4/ATmega32U4

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 28-3 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 28-2. Addressing the Flash Which is Organized in Pages

(1)

Note:

1. PCPAGE and PCWORD are listed in Table 28-11 on page 353.

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

ATmega16U4 Datasheet(PDF) 356 Page - ATMEL Corporation