Rainbow-electronics ATmega128RFA1 Bedienungsanleitung Seite 461

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461
8266A-MCU Wireless-12/09
ATmega128RFA1
Table 30-6. Explanation of different variables used in Figure 30-3 on page 454 and the
mapping to the Z-pointer for 128kByte of Flash Memory
Variable Value
Corresponding
Z-value
(2)
Description
(1)
PCMSB 15
Most significant bit in the Program Counter.
(The Program Counter is 16 bits PC[15:0])
PAGEMSB 6
Most significant bit which is used to address
the words within one page (128 words in a
page requires seven bits PC [6:0]).
ZPCMSB Z16
(3)
Bit in Z-pointer that is mapped to PCMSB.
Because Z0 is not used, the ZPCMSB
equals PCMSB + 1.
ZPAGEMSB Z7
Bit in Z-pointer that is mapped to PCMSB.
Because Z0 is not used; the ZPAGEMSB
equals PAGEMSB + 1.
PCPAGE PC[15:7] Z16
(3)
:Z8
Program Counter page address: Page
select, for Page Erase and Page Write.
PCWORD PC[6:0] Z7:Z1
Program Counter word address: Word
select, for filling temporary buffer (must be
zero during Page Write operation)
Notes: 1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
2. See "Addressing the Flash During Self-Programming" on page 453 for details
about the use of Z-pointer during Self-Programming.
3. The Z-register is only 16 bits wide. Bit 16 is located in the RAMPZ register in the
I/O map.
Table 30-7. Boot Size Configuration with 128kByte of Flash Memory
(1)
BOOTSZ1
BOOTSZ0
Boot Size
Pages
Application Flash
Section
Boot Loader Flash
Section
End Application
Section
Boot Reset Address
(Start Boot Loader
Section)
1 1
512
words
4
0x0000 –
0xFDFF
0xFE00 –
0xFFFF
0xFDFF 0xFE00
1 0
1024
words
8
0x0000 –
0xFBFF
0xFC00 –
0xFFFF
0xFBFF 0xFC00
0 1
2048
words
16
0x0000 –
0xF7FF
0xF800 –
0xFFFF
0xF7FF 0xF800
0 0
4096
words
32
0x0000 –
0xEFFF
0xF000 –
0xFFFF
0xEFFF 0xF000
Note: 1. The different BOOTSZ Fuse configurations are shown in Figure 30-2 on page 452.
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