Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 263)

263

ATmega169V/L

2514A–AVR–08/02

ret

; re-enable the RWW section

ldi spmcrval, (1<<RWWSRE) | (1<<SPMEN)

call Do_spm

rjmp Return

Do_spm:

; check for previous SPM complete

Wait_spm:

in temp1, SPMCSR

sbrc temp1, SPMEN

rjmp Wait_spm

; input: spmcrval determines SPM action

; disable interrupts if enabled, store status

in temp2, SREG

cli

; check that no EEPROM write access is present

Wait_ee:

sbic EECR, EEWE

rjmp Wait_ee

; SPM timed sequence

out SPMCSR, spmcrval

spm

; restore SREG (to enable interrupts if originally enabled)

out SREG, temp2

ret

ATmega169 Boot Loader

Parameters

In Table 113 through Table 115, the parameters used in the description of the Self-Pro-

gramming are given.

Note: 1. The different BOOTSZ Fuse configurations are shown in Figure 116

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

page 252 and “RWW – Read-While-Write Section” on page 252.

Table 113. Boot Size Configuration

(1)

BOOT

SZ1

BOOTS

Boot

Size Pages

Appli-

cation

Flash

Section

Boot

Loader

Flash

Section

End

Appli-

cation

Section

Boot Reset

Address (Start

Boot Loader

Section)

11128

words

2 0x0000 -

0x1F7F

0x1F80 -

0x1FFF

0x1F7F 0x1F80

10256

words

4 0x0000 -

0x1EFF

0x1F00 -

0x1FFF

0x1EFF 0x1F00

01512

words

8 0x0000 -

0x1DFF

0x1E00 -

0x1FFF

0x1DFF 0x1E00

0 0 1024

words

16 0x0000 -

0x1BFF

0x1C00

0x1FFF

0x1BFF 0x1C00

Table 114. Read-While-Write Limit

(1)

Section Pages Address

Read-While-Write section (RWW) 112 0x0000 - 0x1BFF

No Read-While-Write section (NRWW) 16 0x1C00 - 0x1FFF

1 2 ... 258 259 260 261 262 263 264 265 266 267 268 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 263

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