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ST72321 Datasheet(PDF) 19 Page - STMicroelectronics |
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ST72321 Datasheet(HTML) 19 Page - STMicroelectronics |
19 / 185 page ST72321 19/185 FLASH PROGRAM MEMORY (Cont’d) 4.5 ICP (In-Circuit Programming) To perform ICP the microcontroller must be switched to ICC (In-Circuit Communication) mode by an external controller or programming tool. Depending on the ICP code downloaded in RAM, Flash memory programming can be fully custom- ized (number of bytes to program, program loca- tions, or selection serial communication interface for downloading). When using an STMicroelectronics or third-party programming tool that supports ICP and the spe- cific microcontroller device, the user needs only to implement the ICP hardware interface on the ap- plication board (see Figure 6). For more details on the pin locations, refer to the device pinout de- scription. 4.6 IAP (In-Application Programming) This mode uses a BootLoader program previously stored in Sector 0 by the user (in ICP mode or by plugging the device in a programming tool). This mode is fully controlled by user software. This allows it to be adapted to the user application, (us- er-defined strategy for entering programming mode, choice of communications protocol used to fetch the data to be stored, etc.). For example, it is possible to download code from the SPI, SCI, USB or CAN interface and program it in the Flash. IAP mode can be used to program any of the Flash sectors except Sector 0, which is write/erase pro- tected to allow recovery in case errors occur dur- ing the programming operation. 4.7 Related Documentation For details on Flash programming and ICC proto- col, refer to the ST7 Flash Programming Refer- ence Manual and to the ST7 ICC Protocol Refer- ence Manual . 4.7.1 Register Description FLASH CONTROL/STATUS REGISTER (FCSR) Read /Write Reset Value: 0000 0000 (00h) This register is reserved for use by Programming Tool software. It controls the Flash programming and erasing operations. Flash Control/Status Reg- ister Address and Reset Value 70 000 00000 Address (Hex.) Register Label 76 54321 0 0029h FCSR Reset Value 000 0000 0 |
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