Boot configuration
16/29 AN2586 Rev 8
4 Boot configuration
4.1 Boot mode selection
In the STM32F10xxx, 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 fourth 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.
The BOOT pins are also resampled when exiting the Standby mode. Consequently, they
must be kept in the required Boot mode configuration in the 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 10 shows the external connection required to select the boot memory of the
STM32F10xxx.
Figure 10. 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
ai14373
V
DD
STM32F10xxx
BOOT0
BOOT1
V
DD
10 kΩ
10 kΩ
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