AT90PWM2 datasheet(286/365 Pages) ATMEL

286 / 365 page

286

AT90PWM2/3

4317B–AVR–02/05

Boot Loader Parameters

In Table 114 through Table 116, the parameters used in the description of the self pro-

gramming are given.

Note:

The different BOOTSZ Fuse configurations are shown in Figure 134.

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

page 274 and “RWW – Read-While-Write Section” on page 274

Note:

1. Z15:Z13: always ignored

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

See “Addressing the Flash During Self-Programming” on page 279 for details about

the use of Z-pointer during Self-Programming.

Table 114. 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)

128

words

0x000 -

0xF7F

0xF80 -

0xFFF

0xF7F

0xF80

256

words

0x000 -

0xEFF

0xF00 -

0xFFF

0xEFF

0xF00

512

words

0x000 -

0xDFF

0xE00 -

0xFFF

0xDFF

0xE00

1024

words

0x000 -

0xBFF

0xC00 -

0xFFF

0xBFF

0xC00

Table 115. Read-While-Write Limit

Section

Pages

Address

Read-While-Write section (RWW)

0x000 - 0xBFF

No Read-While-Write section (NRWW)

0xC00 - 0xFFF

Table 116. Explanation of Different Variables used in Figure 135 and the Mapping to

the Z-pointer

Variable

Corresponding

Z-value

(1)

Description

PCMSB

Most significant bit in the Program Counter.

(The Program Counter is 12 bits PC[11:0])

PAGEMSB

Most significant bit which is used to address the

words within one page (32 words in a page

requires 5 bits PC [4:0]).

ZPCMSB

Z12

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[11:5]

Z12:Z6

Program counter page address: Page select,

for page erase and page write

PCWORD

PC[4:0]

Z5:Z1

Program counter word address: Word select,

for filling temporary buffer (must be zero during

page write operation)

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