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AT90USB162 Datenblatt(PDF) 23 Page - ATMEL Corporation

Teilenummer AT90USB162
Bauteilbeschribung  USB DFU Bootloader
Download  28 Pages
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB162 Datenblatt(HTML) 23 Page - ATMEL Corporation

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23
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


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