AT90PWM2 datasheet(297/365 Pages) ATMEL

297 / 365 page

297

AT90PWM2/3

4317B–AVR–02/05

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 138 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 137. Addressing the Flash Which is Organized in Pages(1)

Note:

1. PCPAGE and PCWORD are listed in Table 127 on page 294.

Figure 138. Programming the Flash Waveforms

(1)

Note:

1. “XX” is don’t care. The letters refer to the programming description above.

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

RDY/BSY

RESET +12V

PAGEL

BS2

0x10

ADDR. LOW

ADDR. HIGH

DATA

DATA LOW

DATA HIGH

ADDR. LOW

DATA LOW

DATA HIGH

XA1

XA0

BS1

XTAL1

AT90PWM2 Datasheet(PDF) 297 Page - ATMEL Corporation

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