AT90SCR100 datasheet(376/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

28.7.14

AT90SCR100 Boot Loader Parameters

In Table 28-7 through Table 28-9, the parameters used in the description of the Self-Program-

ming are given.

The different BOOTSZ Fuse configurations are shown in Figure 28-2.

Note:

1. For details about these two section, see “NRWW – No Read-While-Write Section” on page 364 and “RWW – Read-While-

Write Section” on page 364.

Note:

1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.

See “Addressing the Flash During Self-Programming” on page 369 for details about the use of

Z-pointer during Self-Programming.

Table 28-7.

Boot Size Configuration

BOOTSZ1

BOOTSZ0

Boot Size

Pages

Application

Flash Section

Boot Loader

Flash Section

End Application

Section

Boot Reset

Address

(Start Boot

Loader

Section)

512 words

0x0000 - 0x7DFF

0x7E00 - 0x7FFF

0x7DFF

0x7E00

1024 words

0x0000 - 0x7BFF

0x7C00 - 0x7FFF

0x7BFF

0x7C00

2048 words

0x0000 - 0x77FF

0x7800 - 0x7FFF

0x77FF

0x7800

4096 words

0x0000 - 0x6FFF

0x7000 - 0x7FFF

0x6FFF

0x7000

Table 28-8.

Read-While-Write Limit(1)

Section

Pages

Address

Read-While-Write section (RWW)

224

0x0000 - 0x6FFF

No Read-While-Write section (NRWW)

0x7000 - 0x7FFF

Table 28-9.

Explanation of different variables used in Figure 28-3 and the mapping to the Z-pointer

Variable

Correspondig

Z-value

Description(1)

PCMSB

Most significant bit in the Program Counter. (The Program Counter is 15 bits

PC[14:0])

PAGEMSB

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

Z15

Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the

ZPCMSB equals PCMSB + 1.

ZPAGEMSB

Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the

ZPAGEMSB equals PAGEMSB + 1.

PCPAGE

PC[14:7]

Z15:Z7

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)

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