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ATtiny48 Datasheet(PDF) 181 Page - ATMEL Corporation |
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ATtiny48 Datasheet(HTML) 181 Page - ATMEL Corporation |
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181 / 266 page  181 8008C–AVR–03/09 ATtiny48/88 Write_page: ; Page Erase ldi spmcrval, (1<<PGERS) | (1<<SELFPRGEN) rcallDo_spm ; re-enable the RWW section ldi spmcrval, (1<<CTPB) | (1<<SELFPRGEN) rcallDo_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<<SELFPRGEN) rcallDo_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<<SELFPRGEN) rcallDo_spm ; re-enable the RWW section ldi spmcrval, (1<<CTPB) | (1<<SELFPRGEN) rcallDo_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 rjmp Error sbiw loophi:looplo, 1 ;use subi for PAGESIZEB<=256 brne Rdloop ; return to RWW section ; verify that RWW section is safe to read Return: in temp1, SPMCSR sbrs temp1, RWWSB ; If RWWSB is set, the RWW section is not ready yet ret ; re-enable the RWW section ldi spmcrval, (1<<CTPB) | (1<<SELFPRGEN) rcallDo_spm rjmp Return Do_spm: ; check for previous SPM complete Wait_spm: in temp1, SPMCSR |
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