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AN3216 Datasheet(PDF) 20 Page - STMicroelectronics |
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AN3216 Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 33 page  Boot configuration AN3216 20/33 DocID17496 Rev 7 4 Boot configuration 4.1 Boot mode selection In the STM32L1xxx, three different boot modes can be selected by means of the BOOT[1:0] pins as shown in Table 2. The values on the BOOT pins are latched on the 4th rising edge of SYSCLK after a reset. It is up to the user to set the BOOT1 and BOOT0 pins after reset to select the required boot mode. BOOT0 is a dedicated pin while BOOT1 is shared with a GPIO pin. Once BOOT1 has been sampled, the corresponding GPIO pin is free and can be used by the application. The BOOT pins are also resampled when exiting Standby mode. Consequently, they must be kept in the required Boot mode configuration in Standby mode. After this startup delay has elapsed, the CPU fetches the top-of-stack value from address 0x0000 0000, and starts code execution from the boot memory starting from 0x0000 0004. 4.2 Boot pin connection Figure 12 shows the external connection required to select the boot memory of the STM32L1xxx. Figure 12. Boot mode selection implementation example 1. Resistor values are given only as a typical example. Table 2. Boot modes BOOT mode selection pins Boot mode Aliasing BOOT1 BOOT0 x 0 Main Flash memory Main Flash memory is selected as boot space 0 1 System memory System memory is selected as boot space 1 1 Embedded SRAM Embedded SRAM is selected as boot space ai14373b VDD STM32L1xxx BOOT0 BOOT1 VDD 10 k 10 k |
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