ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/P26.2.5 Simple Assembly Code Example for a Boot LoaderNote that the RWWSB bit will always be read as zero in ATmega 48A/48PA. Nevertheless, it isrecommended to check this bit as shown in the code example, to ensure compatibility withdevices 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;-the routine must be placed inside the Boot space; (at least the Do_spm sub routine). Only code inside NRWW section can; be read during Self-Programming (Page Erase and Page Write).;-registers used: r0, r1, temp1 (r16), temp2 (r17), looplo (r24),; loophi (r25), spmcrval (r20); storing and restoring of registers is not included in the routine; register usage can be optimized at the expense of code size;-It is assumed that either the interrupt table is moved to the Boot; loader section or that the interrupts are disabled..equ PAGESIZEB = PAGESIZE*2 ;PAGESIZEB is page size in BYTES, not words.org SMALLBOOTSTARTWrite_page:; Page Eraseldi spmcrval, (1
ATmega48A/PA/88A/PA/168A/PA/328/Psbci YH, high(PAGESIZEB)Rdloop:lpm r0, Z+ld r1, Y+cpse r0, r1rjmp Errorsbiw loophi:looplo, 1brne Rdloop;use subi for PAGESIZEB
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Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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