Rainbow-electronics ATmega163L Manual do Utilizador descarregar pdf (Página 122)

ATmega163(L)

122

ldi spmcrval, (1<<ASRE) + (1<<SPMEN)

call Do_spm

; transfer data from RAM to Flash page buffer

ldi looplo, low(PAGESIZEB) ;init loop variable

ldi loophi, high(PAGESIZEB) ;not required for PAGESIZEB<=256

Wrloop:

ld r0, Y+

ld r1, Y+

ldi spmcrval, (1<<SPMEN)

call Do_spm

adiw ZH:ZL, 2

sbiw loophi:looplo, 2 ;use subi for PAGESIZEB<=256

brne Wrloop

; execute page write

subi ZL, low(PAGESIZEB) ;restore pointer

sbci ZH, high(PAGESIZEB) ;not required for PAGESIZEB<=256

ldi spmcrval, (1<<PGWRT) + (1<<SPMEN)

call Do_spm

; re-enable the Application Section

ldi spmcrval, (1<<ASRE) + (1<<SPMEN)

call Do_spm

; read back and check, optional

ldi looplo, low(PAGESIZEB) ;init loop variable

ldi loophi, high(PAGESIZEB) ;not required for PAGESIZEB<=256

subi YL, low(PAGESIZEB) ;restore pointer

sbci YH, high(PAGESIZEB)

Rdloop:

lpm r0, Z+

ld r1, Y+

cpse r0, r1

jmp Error

sbiw loophi:looplo, 2 ;use subi for PAGESIZEB<=256

brne Rdloop

; return to Application Section

; verify that Application Section is safe to read

Return:

in temp1, SPMCR

sbrs temp1, ASB ; If ASB is set, the AS is not ready yet

ret

; re-enable the Applicaiton Section

ldi spmcrval, (1<<ASRE) + (1<<SPMEN)

call Do_spm

rjmp Return

Do_spm:

; input: spmcrval determines SPM action

; check that no EEPROM write access is running

Wait_ee:

sbic EECR, EEWE

rjmp Wait_ee

; SPM timed sequence

out SPMCR, spmcrval

spm

.dw $FFFF ; ensure proper pipelining

nop ; of next instruction

; check for SPM complete

Wait_spm:

in temp1, SPMCR

sbrc temp1, SPMEN

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 155 156

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