ATmega16 datasheet(252/315 Pages) ATMEL

252 / 315 page

252

ATmega16(L)

2466E–AVR–10/02

ATmega16 Boot Loader

Parameters

In Table 99 through Table 101, the parameters used in the description of the self pro-

gramming are given.

Note:

1. The different BOOTSZ Fuse configurations are shown in Figure 125

Note:

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

page 242 and “RWW – Read-While-Write Section” on page 242

Note:

1. Z15:Z14: always ignored

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

Table 99. Boot Size Configuration(1)

BOOTSZ1

BOOTSZ0

Boot

Size

Pages

Application

Flash

Section

Boot

Loader

Flash

Section

End

Application

section

Boot Reset

Address

(start Boot

Loader

Section)

128

words

$0000 -

$1F7F

$1F80 -

$1FFF

$1F7F

$1F80

256

words

$0000 -

$1EFF

$1F00 -

$1FFF

$1EFF

$1F00

512

words

$0000 -

$1DFF

$1E00 -

$1FFF

$1DFF

$1E00

1024

words

$0000 -

$1BFF

$1C00 -

$1FFF

$1BFF

$1C00

Table 100. Read-While-Write Limit

(1)

Section

Pages

Address

Read-While-Write section (RWW)

112

$0000 - $1BFF

No Read-While-Write section (NRWW)

$1C00 - $1FFF

Table 101. Explanation of Different Variables used in Figure 126 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 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 6 bits PC [5:0]).

ZPCMSB

Z13

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[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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