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ST10F276Z5T3 Datasheet(PDF) 64 Page - STMicroelectronics |
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ST10F276Z5T3 Datasheet(HTML) 64 Page - STMicroelectronics |
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64 / 229 page  Bootstrap loader ST10F276 64/229 5.5 Comparing the old and the new bootstrap loader The following tables summarizes the differences between the old ST10 (boot via UART only) bootstrap and the new one (boot via UART or CAN). 5.5.1 Software aspects As the CAN1 is needed, XPERCON register is configured by the bootstrap loader code and bit XPEN of SYSCON is set. However, as long as the EINIT instruction is not executed (and it is not in the bootstrap loader code), the settings can be modified. To do this, perform the following steps: ● DIsable the XPeripherals by clearing XPEN in SYSCON register. Attention: If this part of the code is located in XRAM, it will be disabled. ● Enable the needed XPeripherals by writing the correct value in XPERCON register. ● Set XPEN bit in SYSCON. Table 33. Software topics summary Old bootstrap loader New bootstrap loader Comments Uses only 32 bytes in Dual- Port RAM from 00’FA40h Uses up to 128 bytes in Dual-Port RAM from 00’FA40h For compatibility between boot via UART and boot via CAN1, please avoid loading the application software in the 00’FA60h/00’FABFh range. Loads 32 bytes from UART Loads 32 bytes from UART (boot via UART mode) Same files can be used for boot via UART. User selected Xperipherals can be enabled during boot (Step 3 or Step 4). Xperipherals selection is fixed. User can change the Xperipherals selections through a specific code. |
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