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ATmega32U2 Datasheet(PDF) 254 Page - ATMEL Corporation

Part # ATmega32U2
Description  8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller
PDF  314 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32U2 Datasheet(HTML) 254 Page - ATMEL Corporation

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254
7799B–AVR–07/09
ATmega8U2/16U2/32U2
1.
Set XA1, XA0 to “00”. This enables address loading.
2.
Set BS2, BS1 to “10”. This selects the address extended high byte.
3.
Set DATA = Address extended high byte (0x00 - 0xFF).
4.
Give XTAL1 a positive pulse. This loads the address high byte.
I. Program Page
1.
Set BS2, BS1 to “00”
2.
Give WR a negative pulse. This starts programming of the entire page of data.
RDY/BSY goes low.
3.
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.
1. Set XA1, XA0 to “10”. This enables command loading.
2.
Set DATA to “0000 0000”. This is the command for No Operation.
3.
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]:
00
01
02
PAGEEND
PAGE
PCWORD
PCPAGE
PCMSB
PAGEMSB
PROGRAM
COUNTER



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