Rainbow-electronics ATmega64L Manuel d'utilisateur télécharger pdf (Page 252)

252

ATmega16(L)

2466B–09/01

Note: 1. The different BOOTSZ fuse configurations are shown in Figure 126

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

page 241 and “RWW - Read-While-Write section” on page 241

Note: 1. Z15:Z14: 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 246 for details about

the use of Z-pointer during self-programming.

Table 100. 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 101. Read-While-Write Limit

(1)

Section Pages Address

Read-While-Write section (RWW) 112 $0000 - $1BFF

No Read-While-Write section (NRWW) 16 $1C00 - $1FFF

Table 102. Explanation of Different Variables used in Figure 127 and the Mapping to

the Z-Pointer

Variable

Corresponding

Z-value

(1)

Description

PCMSB

12 Most significant bit in the program counter. (The

program counter is 13 bits PC[12:0])

PAG EMS B

5 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

Z6 Bit in Z-register 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)

1 2 ... 247 248 249 250 251 252 253 254 255 256 257 ... 297 298

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Rainbow-electronics ATmega64L Manuel d'utilisateur Page 252

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