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ST10F273Z4T3 Datasheet(PDF) 44 Page - STMicroelectronics |
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ST10F273Z4T3 Datasheet(HTML) 44 Page - STMicroelectronics |
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44 / 179 page  Bootstrap loader ST10F273 44/179 6 Bootstrap loader ST10F273 implements Boot capabilities in order to: ● Support bootstrap via UART or bootstrap via CAN for the standard bootstrap. ● Support a selective bootstrap loader, to manage the bootstrap sequence in a different way. 6.1 Selection among user-code, standard or selective bootstrap The boot modes are triggered with a special combination set on Port0L[5...4]. Those signals, as other configuration signals, are latched on the rising edge of RSTIN pin. ● Decoding of reset configuration (P0L.5 = 1, P0L.4 = 1) will select the normal mode (also called User mode) and select the user Flash to be mapped from address 00’0000h. ● Decoding of reset configuration (P0L.5 = 1, P0L.4 = 0) will select ST10 standard bootstrap mode (Test-Flash is active and overlaps user Flash for code fetches from address 00'0000h; user Flash is active and available for read accesses). ● Decoding of reset configuration (P0L.5 = 0, P0L.4 = 1) will activate new verifications to select which bootstrap software to execute: – if the User mode signature in the User Flash is programmed correctly, then a software reset sequence is selected and the User code is executed; – if the User mode signature is not programmed correctly in the user Flash, then the User key location is read again. Its value will determine which communication channel will be enabled for bootstraping. 6.2 Standard bootstrap loader After entering the standard BSL mode and the respective initialization, the ST10F273 scans the RxD0 line and the CAN1_RxD line to receive either a valid dominant bit from CAN interface, or a start condition from UART line. Start condition on UART RxD: ST10F273 starts standard bootstrap loader. This bootstrap loader is identical to other ST10 devices (example: ST10F269, ST10F168). Valid dominant bit on CAN1 RxD: ST10F273 start bootstrapping via CAN1. Table 26. ST10F273 boot mode selection P0.5 P0.4 ST10 decoding 11 User mode: user Flash mapped at 00’0000h 10 Standard bootstrap loader: User Flash mapped from 00’0000h, code fetches redirected to Test-Flash at 00’0000h 01 Selective boot mode: User Flash mapped from 00’0000h, code fetches redirected to Test-Flash at 00’0000h (different sequence execution in respect of Standard Bootstrap Loader) 00 Reserved |
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