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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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PCIF0 Folha de dados(PDF) 234 Page - ATMEL Corporation |
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PCIF0 Folha de dados(HTML) 234 Page - ATMEL Corporation |
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234 / 294 page  234 9219A–RFID–01/11 Atmel ATA5505 [Preliminary] 21.2.7 Simple Assembly Code Example for a Boot Loader Note that the RWWSB bit will always be read as zero in the Atmel ® AVR®. Nevertheless, it is recommended to check this bit as shown in the code example, to ensure compatibility with devices supporting Read-While-Write. ;- The routine writes one page of data from RAM to Flash ; the first data location in RAM is pointed to by the Y-pointer ; the first data location in Flash is pointed to by the Z-pointer ;- Error handling is not included ;- Registers used: r0, r1, temp1 (r16), temp2 (r17), looplo (r24), ; loophi (r25), spmcsrval (r20) ; - Storing and restoring of registers is not included in the routine ; register usage can be optimized at the expense of code size .equ PAGESIZEB = PAGESIZE*2 ; AGESIZEB is page size in BYTES, not words .org SMALLBOOTSTART Write_page: ; Page Erase ldi spmcsrval, (1<<PGERS) | (1<<SELFPGEN) rcall Do_spm ; Clear temporary page buffer ldi spmcsrval, (1<<CPTB) | (1<<SELFPGEN) rcall Do_spm ; Transfer data from RAM to Flash temporary 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 spmcsrval, (1<<SELFPGEN) rcall 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 spmcsrval, (1<<PGWRT) | (1<<SELFPGEN) rcall Do_spm ; Clear temporary page buffer ldi spmcsrval, (1<<CPTB) | (1<<SELFPGEN) rcall 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+ |
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