AT90USB82 datasheet(24/28 Pages) ATMEL

24 / 28 page

7618C–AVR–07/08

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

; NAME: flash_read_sig

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

; PARAMS:

; Return: R16: signature value

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

; PURPOSE:

Read harware signature byte. THe byte is selected trought the

addr

; passed as argument (see product data sheet)

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

flash_read_sig:

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,$21

;(1<<SPMEN) | (1<<SIGRD))

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

LPM

;Store program memory

MOV

R16, R0

;Store return value (1byte->R16 register)

RJMP

WAIT_SPMEN

;Wait for SPMEN flag cleared

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

; NAME: flash_read_fuse

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

; Return: R16: fuse value

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

; PURPOSE: Read fuse byte. The fuse byte is elected through the address

passed

; as argument (See product datasheet for addr value)

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

flash_read_fuse:

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,$09

;(1<<SPMEN) | (1<<BLBSET))

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

LPM

;Store program memory

MOV

R16, R0

;Store return value (1byte->R16 register)

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