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PIC24FJ64GA Datasheet(PDF) 27 Page - Microchip Technology |
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PIC24FJ64GA Datasheet(HTML) 27 Page - Microchip Technology |
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27 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 27 PIC24FJXXXGA0XX 4.0 DEVICE PROGRAMMING – ENHANCED ICSP This section discusses programming the device through Enhanced ICSP and the programming execu- tive. The programming executive resides in executive memory (separate from code memory) and is executed when Enhanced ICSP Programming mode is entered. The programming executive provides the mechanism for the programmer (host device) to program and verify the PIC24FJXXXGA0XX devices using a simple command set and communication protocol. There are several basic functions provided by the programming executive: • Read Memory • Erase Memory • Program Memory • Blank Check • Read Executive Firmware Revision The programming executive performs the low-level tasks required for erasing, programming and verifying a device. This allows the programmer to program the device by issuing the appropriate commands and data. Table 4-1 summarizes the commands. A detailed description for each command is provided in Section 5.2 “Programming Executive Commands”. TABLE 4-1: COMMAND SET SUMMARY The programming executive uses the device’s data RAM for variable storage and program execution. After the programming executive has run, no assumptions should be made about the contents of data RAM. 4.1 Overview of the Programming Process Figure 4-1 shows the high-level overview of the programming process. After entering Enhanced ICSP mode, the programming executive is verified. Next, the device is erased. Then, the code memory is programmed, followed by the configuration locations. Code memory (including the Configuration registers) is then verified to ensure that programming was successful. After the programming executive has been verified in memory (or loaded if not present), the PIC24FJXXXGA0XX family can be programmed using the command set shown in Table 4-1. FIGURE 4-1: HIGH-LEVEL ENHANCED ICSP™ PROGRAMMING FLOW 4.2 Confirming the Presence of the Programming Executive Before programming can begin, the programmer must confirm that the programming executive is stored in executive memory. The procedure for this task is shown in Figure 4-2. First, In-Circuit Serial Programming mode (ICSP) is entered. Then, the unique Application ID Word stored in executive memory is read. If the programming executive is resident, the Application ID Word is BBh, which means programming can resume as normal. However, if the Application ID Word is not BBh, the programming executive must be programmed to executive code memory using the method described in Section 5.4 “Programming the Programming Executive to Memory”. Section 3.0 “Device Programming – ICSP” describes the ICSP programming method. Section 3.11 “Reading the Application ID Word” describes the procedure for reading the Application ID Word in ICSP mode. Command Description SCHECK Sanity Check READC Read Device ID Registers READP Read Code Memory PROGP Program One Row of Code Memory and Verify PROGW Program One Word of Code Memory and Verify QBLANK Query if the Code Memory is Blank QVER Query the Software Version Start Done Perform Chip Erase Program Memory Verify Program Enter Enhanced ICSP™ Program Configuration Bits Verify Configuration Bits Exit Enhanced ICSP |
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