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PIC24FJ64GA 数据表(PDF) 32 Page - Microchip Technology |
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PIC24FJ64GA 数据表(HTML) 32 Page - Microchip Technology |
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32 / 52 page  PIC24FJXXXGA0XX DS39768D-page 32 © 2008 Microchip Technology Inc. 4.6.2 PROGRAMMING METHODOLOGY Configuration bits may be programmed a single byte at a time using the PROGW command. This command specifies the configuration data and Configuration register address. When Configuration bits are programmed, any unimplemented or reserved bits must be programmed with a ‘1’. Two PROGW commands are required to program the Configuration bits. A flowchart for Configuration bit programming is shown in Figure 4-5. 4.6.3 PROGRAMMING VERIFICATION After the Configuration bits are programmed, the contents of memory should be verified to ensure that the programming was successful. Verification requires the Configuration bits to be read back and compared against the copy held in the programmer’s buffer. The READP command reads back the programmed Configuration bits and verifies that the programming was successful. 4.6.4 CODE-PROTECT CONFIGURATION BITS CW1 Configuration register controls code protection for the PIC24FJXXXGA0XX family. Two forms of code pro- tection are provided. One form prevents code memory from being written (write protection) and the other prevents code memory from being read (read protection). GWRP (CW1<12>) controls write protection and GCP (CW1<13>) controls read protection. Protection is enabled when the respective bit is ‘0’. Erasing sets GWRP and GCP to ‘1’, which allows the device to be programmed. When write protection is enabled (GWRP = 0), any programming operation to code memory will fail. When read protection is enabled (GCP = 0), any read from code memory will cause a 0h to be read, regard- less of the actual contents of code memory. Since the programming executive always verifies what it programs, attempting to program code memory with read protection enabled also will result in failure. It is imperative that both GWRP and GCP are ‘1’ while the device is being programmed and verified. Only after the device is programmed and verified should either GWRP or GCP be programmed to ‘0’ (see Section 4.6 “Configuration Bits Programming”). Note: If the General Segment Code-Protect bit (GCP) is programmed to ‘0’, code memory is code-protected and can not be read. Code memory must be verified before enabling read protection. See Section 4.6.4 “Code-Protect Configuration Bits” for more information about code-protect Configuration bits. Note: Bulk Erasing in ICSP mode is the only way to reprogram code-protect bits from an ON state (‘0’) to an Off state (‘1’). |
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