DOC7707 datasheet(240/307 Pages) ETC1

240 / 307 page

240

7707F–AVR–11/10

AT90USB82/162

The different BOOTSZ Fuse configurations are shown in Figure 23-2.

Note:

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

226 and “RWW – Read-While-Write Section” on page 226.

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 233 for details about the use of

Z-pointer during Self-Programming.

Table 23-9.

Read-While-Write Limit

(1)

Device

Section

Pages

Address

16K

Read-While-Write section (RWW)

0x0000 - 0x2FFF

No Read-While-Write section (NRWW)

0x3000 - 0x3FFF

Read-While-Write section (RWW)

0x0000 - 0x0FFF

No Read-While-Write section (NRWW)

0x1000 - 0x1FFF

Table 23-10. Explanation of different variables used in Figure 23-4 and the mapping to the Z-

pointer

Variable

Corresponding

Z-value

Description(1)

PCMSB

Most significant bit in the Program Counter. (The

Program Counter is 13 bits PC[12:0])

PAGEMSB

Most significant bit which is used to address the

words within one page (64 words in a page

requires six bits PC [5:0]).

ZPCMSB

Z13

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[12:6]

Z13:Z7

Program Counter page address: Page select, for

Page Erase and Page Write

PCWORD

PC[5:0]

Z6:Z1

Program Counter word address: Word select, for

filling temporary buffer (must be zero during

Page Write operation)

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