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PXAG49KBBD Datasheet(PDF) 13 Page - NXP Semiconductors |
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PXAG49KBBD Datasheet(HTML) 13 Page - NXP Semiconductors |
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13 / 42 page  Philips Semiconductors Preliminary data XA-G49 XA 16-bit microcontroller family 64K Flash/2K RAM, watchdog, 2 UARTs 2001 Jun 27 13 User Supplied Loader A user program can simply decide at any time, for any reason, to begin Flash programming operations. All it has to do in advance is to instruct external circuitry to apply +5 V or +12 V to the VPP pin, and make certain that the Boot ROM is enabled. User code may contain a loader designed to replace the application code contained in the Flash memory by loading new code through any communication medium available in the application. This is completely flexible and defined by the designer of the system. It could be done serially using RS-232, serially using some other method, or even parallel over a user defined I/O port. The user has the freedom to choose a method that does not interfere with the application circuit. As an added feature, the application program may also use the Flash memory as a long term data storage, saving configuration information, sensor readings, or any other desired data. The actual loader code would typically be programmed by the user into the microcontroller in a parallel fashion or via the default loader during their manufacturing process. The entire initial Flash contents may be programmed at that time, or the rest of the application may be programmed into the Flash memory at a later time, possibly using the loader code to do the programming. This application controlled programming capability allows for the possibility of changing the application code in the field. If the application circuit is embedded in a PC, or has a way to establish a telephone data link to a user’s or manufacturer’s computer, new code could be downloaded from diskette or a manufacturer’s support system. There is even the possibility of conducting very specialized remote testing of a failing circuit board by the manufacturer by remotely programming a series of detailed test programs into the application board and checking the results. Any user supplied loader should take the watchdog timer into account. Typically, the watchdog timer would be disabled upon entry to the loader if it might be running, in order to prevent a watchdog reset from occurring during programming. |
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