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| AT90PWM3_08 Datasheet, PDF (287/361 Pages) ATMEL Corporation – 8-bit Microcontroller with 8K Bytes In-System Programmable Flash | |||
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1. Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY
goes low.
2. Wait until RDY/BSY goes high (See Figure 25-3 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. 1. Set XA1, XA0 to â10â. This enables command loading.
2. Set DATA to â0000 0000â. 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)
PCMSB
PROGRAM
COUNTER
PCPAGE
PAGEMSB
PCWORD
PAGE ADDRESS
WITHIN THE FLASH
WORD ADDRESS
WITHIN A PAGE
PROGRAM MEMORY
PAGE
PAGE
INSTRUCTION WORD
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
288
Note: 1. PCPAGE and PCWORD are listed in Table 25-11 on page 285.
Figure 25-3. Programming the Flash Waveforms(1)
F
DATA
XA1
XA0
BS1
XTAL1
WR
RDY/BSY
RESET +12V
OE
PAGEL
BS2
A
0x10
B
C
D
E
ADDR. LOW DATA LOW DATA HIGH
XX
B
C
D
E
ADDR. LOW DATA LOW DATA HIGH
XX
G
ADDR. HIGH
H
XX
Note: 1. âXXâ is donât care. The letters refer to the programming description above.
AT90PWM2/3/2B/3B
4317IâAVRâ01/08
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