AT90USB82 datasheet(22/28 Pages) ATMEL

22 / 28 page

7618C–AVR–07/08

;**************************************************************************

flash_prg_page:

RCALL

WAIT_SPMEN

;Wait for SPMEN flag cleared

MOV

R31,R17

MOV

R30,R16

;move adress to z pointer (R31=ZH R30=ZL)

OUT

RAMPZ, R18

LDI

R20,$05

;(1<<PGWRT) + (1<<SPMEN))

OUT SPMCSR,R20; argument 2 decides function (r18)

SPM

;Store program memory

RCALL

WAIT_SPMEN

;Wait for SPMEN flag cleared

RCALL

flash_rww_enable

RET

;*F************************************************************************

; NAME: flash_page_erase

;--------------------------------------------------------------------------

; PARAMS:

R18:17:R16: The byte address of the page

;--------------------------------------------------------------------------

; PURPOSE:

Launch the erase sequence of the target page

;--------------------------------------------------------------------------

; NOTE:

This function does nt set the RWWSE bit after erase. Thus it does

not

; erase the hardware temporary temp buffer.

; This function is for bootloader usage

;--------------------------------------------------------------------------

; REQUIREMENTS:

;**************************************************************************

flash_page_erase:

RCALL

WAIT_SPMEN

;Wait for SPMEN flag cleared

MOV

R31,R17

MOV

R30,R16

;move adress to z pointer (R31=ZH R30=ZL)

OUT

RAMPZ, R18

LDI

R20,$03

;(1<<PGERS) + (1<<SPMEN)))

OUT SPMCSR, R20; argument 2 decides function (r18)

SPM

;Store program memory

RCALL

WAIT_SPMEN

;Wait for SPMEN flag cleared

;RCALL

flash_rww_enable CAUTION DO NOT ACTIVATE HERE or

;

you will loose the entire page buffer content !!!

RET

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