AT90USB82 datasheet(23/28 Pages) ATMEL

23 / 28 page

7618C–AVR–07/08

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

; NAME: flash_page_erase_public

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

; PARAMS:

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

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

; PURPOSE:

Launch the erase sequence of the target page

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

; NOTE:

!!!!This function set the RWWSE bit after erase. Thus it

; erase the hardware temporary temp buffer after page erase

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

flash_page_erase_public:

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)))

OUTSPMCSR, 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_rww_enable

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

; PARAMS:

none

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

; PURPOSE:

Set RWSE bit. It allows to execute code in the application

section

; after a flash prog (erase or write page)

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

flash_rww_enable:

RCALL

WAIT_SPMEN

;Wait for SPMEN flag cleared

LDI

R20,$11

;(1<<WWSRE) + (1<<SPMEN)))

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

SPM

;Store program memory

RJMP

WAIT_SPMEN

;Wait for SPMEN flag cleared

AT90USB82 Datasheet(PDF) 23 Page - ATMEL Corporation

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