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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC12F615-E/MS датащи(PDF) 30 Page - Microchip Technology |
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PIC12F615-E/MS датащи(HTML) 30 Page - Microchip Technology |
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30 / 212 page  PIC12F609/615/617/12HV609/615 DS41302D-page 30 2010 Microchip Technology Inc. 3.3 Reading the Flash Program Memory To read a program memory location, the user must write two bytes of the address to the PMADRL and PMADRH registers, and then set control bit RD (PMCON1<0>). Once the read control bit is set, the program memory Flash controller will use the second instruction cycle after to read the data. This causes the second instruction immediately following the “BSF PMCON1,RD ” instruction to be ignored. The data is available in the very next cycle in the PMDATL and PMDATH registers; it can be read as two bytes in the following instructions. PMDATL and PMDATH regis- ters will hold this value until another read or until it is written to by the user (during a write operation). EXAMPLE 3-1: FLASH PROGRAM READ BANKSEL PM_ADR ; Change STATUS bits RP1:0 to select bank with PMADRL MOVLW MS_PROG_PM_ADDR ; MOVWF PMADRH ; MS Byte of Program Address to read MOVLW LS_PROG_PM_ADDR ; MOVWF PMADRL ; LS Byte of Program Address to read BANKSEL PMCON1 ; Bank to containing PMCON1 BSF PMCON1, RD ; PM Read NOP ; First instruction after BSF PMCON1,RD executes normally NOP ; Any instructions here are ignored as program ; memory is read in second cycle after BSF PMCON1,RD ; BANKSEL PMDATL ; Bank to containing PMADRL MOVF PMDATL, W ; W = LS Byte of Program PMDATL MOVF PMDATH, W ; W = MS Byte of Program PMDATL |
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