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OPTION_REG 数据表(PDF) 106 Page - Microchip Technology |
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OPTION_REG 数据表(HTML) 106 Page - Microchip Technology |
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106 / 222 page  MCP19111 DS22331A-page 106 2013 Microchip Technology Inc. 18.3.1 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 18-1: FLASH PROGRAM READ FIGURE 18-1: FLASH PROGRAM MEMORY READ CYCLE EXECUTION – NORMAL MODE BANKSELPM_ADR; Change STATUS bits RP1:0 to select bank with PMADR MOVLWMS_PROG_PM_ADDR; MOVWFPMADRH; MS Byte of Program Address to read MOVLWLS_PROG_PM_ADDR; MOVWFPMADRL; LS Byte of Program Address to read BANKSELPMCON1; Bank to containing PMCON1 BSF PMCON1, RD; EE 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 ; BANKSELPMDATL; Bank to containing PMADRL MOVFPMDATL, W; W = LS Byte of Program PMDATL MOVFPMDATH, W; W = MS Byte of Program PMDATL Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 BSF PMCON1,RD Executed here INSTR (PC + 1) Executed here NOP Executed here PC PC + 1 PMADRH,PMADRL PC+3 PC + 5 Flash ADDR RD bit INSTR (PC) PMDATH,PMDATL INSTR (PC + 3) PC + 3 PC + 4 INSTR (PC + 4) INSTR (PC + 1) INSTR (PC - 1) Executed here INSTR (PC + 3) Executed here INSTR (PC + 4) Executed here Flash DATA PMDATH PMDATL Register EERHLT |
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