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ATmega128
section that is being programmed (erased or written), not which section that actually is being
read during a Boot Loader software update.
Read-While-Write
Section – RWW
No Read-While-Write
Section – NRWW
If a Boot Loader software update is programming a page inside the R WW section, it is possible
to read code from the Flash, but only code that is located in the NR WW section. During an on-
going programming, the software must ensure that the R WW section never is being read. If the
user software is trying to read code that is located inside the R WW section (i.e., by a
call/jmp/lpm or an interrupt) during programming, the software might end up in an unknown
state. To avoid this, the interrupts should either be disabled or moved to the Boot Loader Sec-
tion. The Boot Loader section is always located in the NR WW section. The R WW Section Busy
bit (R WW SB) in the Store Program Memory Control and Status Register (SPMCSR) will be read
as logical one as long as the R WW section is blocked for reading. After a programming is com-
pleted, the R WW SB must be cleared by software before reading code located in the R WW
section. See “Store Program Memory Control and Status Register – SPMCSR” on page 277. for
details on how to clear R WW SB.
The code located in the NR WW section can be read when the Boot Loader software is updating
a page in the R WW section. W hen the Boot Loader code updates the NR WW section, the CPU
is halted during the entire page erase or page write operation.
Table 107. Read- W hile- W rite Features
Which Section does the Z-
Which Section can be
Read-While-
pointer Address During the
Programming?
R WW section
NR WW section
Read During
Programming?
NR WW section
None
Is the CPU
Halted?
No
Yes
Write
Supported?
Yes
No
Figure 132. Read- W hile- W rite vs. No Read- W hile- W rite
Read-While-Write
(RWW) Section
Z-pointer
Addresses NRWW
Z-pointer
Addresses RWW
Section
No Read-While-Write
(NRWW) Section
Section
CPU is Halted
During the Operation
Code Located in
NRWW Section
Can be Read During
the Operation
274
2467X–AVR–06/11
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