AT90USB646 datasheet(367/434 Pages) ATMEL

367 / 434 page

367

7593A–AVR–02/06

AT90USB64/128

Note:

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

353 and “RWW – Read-While-Write Section” on page 353.

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 360 for details about the use of

Z-pointer during Self-Programming.

Table 28-9.

Read-While-Write Limit (Word Addresses)

(1)

Device

Section

Pages

Address

AT90USB64

Read-While-Write section (RWW)

224

0x0000 - 0x6FFF

No Read-While-Write section (NRWW)

0x7000 - 0x7FFF

AT90USB28

Read-While-Write section (RWW)

480

0x0000 - 0xEFFF

No Read-While-Write section (NRWW)

0xF000 - 0xFFFF

Table 28-10.

Explanation of different variables used in Figure 28-4 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 17 bits PC[16:0])

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

Z17

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 +

PCPAGE

PC[16:7]

Z17: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)

PCMSB

Most significant bit in the program counter. (The program

counter is 16 bits PC[15:0])

PAGEMSB

Most significant bit which is used to address the words

within one page (128 words in a page requires 7 bits PC

[6:0]).

ZPCMSB

Z16

Bit in Z-register that is mapped to PCMSB. Because Z0 is

not used, the ZPCMSB equals PCMSB + 1.

ZPAGEMSB

Bit in Z-register that is mapped to PAGEMSB. Because Z0

is not used, the ZPAGEMSB equals PAGEMSB + 1.

PCPAGE

PC[15:7]

Z16: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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