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ST10F296 数据表(PDF) 67 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 67 Page - STMicroelectronics |
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67 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E The bootstrap loader 67/346 6.2 Standard bootstrap loader (BSL) The built-in bootstrap loader of the ST10F296E provides a mechanism to load the startup program, which is executed after reset, via the serial interface. In this case no external (ROM) memory or internal ROM is required for the initialization code starting at location 00’0000H. The bootstrap loader moves code/data into the IRAM, but it is also possible to transfer data via the serial interface into an external RAM using a second level loader routine. ROM memory (internal or external) is not necessary. However, it may be used to provide lookup tables or may provide ‘core-code’, a set of general purpose subroutines, for I/O operations, number crunching, system initialization, etc. The bootstrap loader may be used to load the complete application software into ROMless systems. It may also load temporary software into complete systems for testing or calibration. in addition, it may be used to load a programming routine for Flash devices. The BSL mechanism may be used for standard system startup as well as for special occasions such as system maintenance (firmware update), end-of-line programming, or testing. 6.2.1 Entering the standard bootstrap loader The ST10F296E enters BSL mode if pin P0L.4 is sampled low at the end of a hardware reset. In this case the built-in bootstrap loader is activated independently of the selected bus mode. The bootstrap loader code is stored in a special Test-Flash: No part of the standard Flash memory area is required for this. After entering BSL mode and completing the respective initialization steps, the ST10F296E scans the RxD0 line and the CAN1_RxD line to receive either a valid dominant bit from the CAN interface, or a start condition from the UART line. Start condition on UART RxD: The ST10F296E starts the standard bootstrap loader. This bootstrap loader is identical to other ST10 devices (for example, the ST10F280). See Section 6.3: Standard bootstrap with UART (RS232 or K-line) on page 73 for details. Valid dominant bit on CAN1 RxD: The ST10F296E starts bootstrapping via CAN1. This bootstrapping method is new and is described in Section 6.4: Standard bootstrap with CAN on page 78. Figure 6: ST10F296E new standard bootstrap loader program flow on page 69 shows the program flow of the new bootstrap loader. It illustrates how new functionalities are implemented, which is as follows: ● UART: UART has priority over CAN after a falling edge on CAN1_RxD untill the first valid rising edge on CAN1_RxD. ● CAN: Pulses on CAN1_RxD which are shorter than 20*CPU-cycles, are filtered. Table 35. ST10F296E boot mode selection P0.5 P0.4 ST10 decoding 1 1 User mode: User Flash is mapped at 00’0000h 10 Standard bootstrap loader: User Flash is mapped from 00’0000h, code fetches redirected data to Test-Flash at 00’0000h 0 1 Alternate boot mode: Flash mapping depends on signature integrity check 00 Reserved Obsolete Product(s) - Obsolete Product(s) |
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