3.2 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 3-2.

First, In-Circuit Serial Programming (ICSP) mode is entered. Then, the unique Application ID Word stored in executive memory is read. If the Programming Executive is resident, the correct Application ID Word, 0xDF, is read and programming can resume as normal. However, if the Application ID Word is not present, the PE must be programmed to executive code memory using the method described in The Programming Executive.

Device Programming – ICSP describes the ICSP programming method. Reading the Application ID Word describes the procedure for reading the Application ID Word in ICSP mode.