Rainbow-electronics ATmega32L Manual de usuario descargar pdf (Pagina 253)

253

ATmega32(L)

2503C–AVR–10/02

ATmega32 Boot Loader

Parameters

In Table 100 through Table 102, 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 243 and “RWW – Read-While-Write Section” on page 243

Note: 1. Z15: 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 247 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)

256

words

$0000 -

$3EFF

$3F00 -

$3FFF

$3EFF $3F00

512

words

$0000 -

$3DFF

$3E00 -

$3FFF

$3DFF $3E00

1024

words

$0000 -

$3BFF

$3C00 -

$3FFF

$3BFF $3C00

2048

words

$0000 -

$37FF

$3800 -

$3FFF

$37FF $3800

Table 101. Read-While-Write Limit

(1)

Section Pages Address

Read-While-Write section (RWW) 224 $0000 - $37FF

No Read-While-Write section (NRWW) 32 $3800 - $3FFF

Table 102. Explanation of Different Variables used in Figure 126 and the Mapping to

the Z-pointer

Variable

Corresponding

Z-value

(1)

Description

PCMSB

13 Most significant bit in the program counter. (The

program counter is 14 bits PC[13:0])

PAGEMSB

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

Z14 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 PAGEMSB.

Because Z0 is not used, the ZPAGEMSB

equals PAGEMSB + 1.

PCPAGE

PC[13:6] Z14: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 ... 248 249 250 251 252 253 254 255 256 257 258 ... 312 313

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics ATmega32L Manual de usuario Pagina 253

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics ATmega32L