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STM32F427XX Datasheet(PDF) 29 Page - STMicroelectronics |
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STM32F427XX Datasheet(HTML) 29 Page - STMicroelectronics |
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29 / 239 page  DocID024030 Rev 9 29/238 STM32F427xx STM32F429xx Functional overview 43 In regulator OFF mode, the following features are no more supported: • PA0 cannot be used as a GPIO pin since it allows to reset a part of the V12 logic power domain which is not reset by the NRST pin. • As long as PA0 is kept low, the debug mode cannot be used under power-on reset. As a consequence, PA0 and NRST pins must be managed separately if the debug connection under reset or pre-reset is required. • The over-drive and under-drive modes are not available. • The Standby mode is not available. Figure 8. Regulator OFF The following conditions must be respected: • VDD should always be higher than VCAP_1 and VCAP_2 to avoid current injection between power domains. • If the time for VCAP_1 and VCAP_2 to reach V12 minimum value is faster than the time for VDD to reach 1.7 V, then PA0 should be kept low to cover both conditions: until VCAP_1 and VCAP_2 reach V12 minimum value and until VDD reaches 1.7 V (see Figure 9). • Otherwise, if the time for VCAP_1 and VCAP_2 to reach V12 minimum value is slower than the time for VDD to reach 1.7 V, then PA0 could be asserted low externally (see Figure 10). • If VCAP_1 and VCAP_2 go below V12 minimum value and VDD is higher than 1.7 V, then a reset must be asserted on PA0 pin. Note: The minimum value of V12 depends on the maximum frequency targeted in the application (see Table 17: General operating conditions). |
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