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ST10F269Z2QX 数据表(PDF) 32 Page - STMicroelectronics |
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ST10F269Z2QX 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 161 page  ST10F269Z2Qx 32/161 Figure 7 : Memory Configuration after Reset 5.6.3 - Loading the Startup Code After sending the identification Byte the BSL enters a loop to receive 32 Bytes via ASC0. These Byte are stored sequentially into locations 00’FA40h through 00’FA5Fh of the internal RAM. So up to 16 instructions may be placed into the RAM area. To execute the loaded code the BSL then jumps to location 00’FA40h, which is the first loaded instruction. The bootstrap loading sequence is now terminated, the ST10F269Z2Qx remains in BSL mode, however. Most probably the initially loaded routine will load additional code or data, as an average application is likely to require substantially more than 16 instructions. This second receive loop may directly use the pre-initialized interface ASC0 to receive data and store it to arbitrary user-defined locations. This second level of loaded code may be the final application code. It may also be another, more sophisticated, loader routine that adds a transmission protocol to enhance the integrity of the loaded code or data. It may also contain a code sequence to change the system configuration and enable the bus interface to store the received data into external memory. This process may go through several iterations or may directly execute the final application. In all cases the ST10F269Z2Qx will still run in BSL mode, that means with the watchdog timer disabled and limited access to the internal Flash area. All code fetches from the internal Flash area (00’0000h...00’7FFFh or 01’0000h...01’7FFFh, if mapped to segment 1) are redirected to the special Boot-ROM. Data fetches access will access the internal Boot-ROM of the ST10F269Z2Qx, if any is available, but will return undefined data on ROMless devices. 5.6.4 - Exiting Bootstrap Loader Mode In order to execute a program in normal mode, the BSL mode must be terminated first. The ST10F269Z2Qx exits BSL mode upon a software reset (ignores the level on P0L.4) or a hardware reset (P0L.4 must be high). After a reset the ST10F269Z2Qx will start executing from location 00’0000h of the internal Flash or the external memory, as programmed via pin EA. 16M Bytes 16M Bytes 16M Bytes BSL mode active Yes (P0L.4=’0’) Yes (P0L.4=’0’) No (P0L.4=’1’) EA pin High Low Access to application Code fetch from internal Flash area Test-Flash access Test-Flash access User Flash access Data fetch from internal Flash area User Flash access User Flash access User Flash access IRAM 1 0 User Flash Test Flash Segment 2 255 Access to: external bus disabled internal enabled Flash 1 0 User Flash Test Flash Segment 2 255 Access to: external bus enabled internal enabled Flash IRAM 1 0 User Flash Segment 2 255 Access: depends on reset config EA, Port0 depends on reset config EA, Port0 IRAM |
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