Datasheet

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STM32F427xx STM32F429xx Recommendations when using internal reset OFF
232
Appendix A Recommendations when using internal reset
OFF
When the internal reset is OFF, the following integrated features are no longer supported:
• The integrated power-on reset (POR) / power-down reset (PDR) circuitry is disabled.
• The brownout reset (BOR) circuitry must be disabled.
• The embedded programmable voltage detector (PVD) is disabled.
• V
BAT
functionality is no more available and VBAT pin should be connected to V
DD
.
• The over-drive mode is not supported.
A.1 Operating conditions
Table 123. Limitations depending on the operating power supply range
Operating
power
supply
range
ADC
operation
Maximum
Flash
memory
access
frequency
with no wait
states
(f
Flashmax
)
Maximum Flash
memory access
frequency with
wait states
(1)(2)
1. Applicable only when the code is executed from Flash memory. When the code is executed from RAM, no
wait state is required.
2. Thanks to the ART accelerator and the 128-bit Flash memory, the number of wait states given here does
not impact the execution speed from Flash memory since the ART accelerator allows to achieve a
performance equivalent to 0 wait state program execution.
I/O operation
Possible Flash
memory
operations
V
DD
=1.7 to
2.1 V
(3)
3. V
DD
/V
DDA
minimum value of 1.7 V, with the use of an external power supply supervisor (refer to
Section 3.17.1: Internal reset ON).
Conversion
time up to
1.2 Msps
20 MHz
(4)
4. Prefetch is not available. Refer to AN3430 application note for details on how to adjust performance and
power.
168 MHz with 8
wait states and
over-drive OFF
– No I/O
compensation
8-bit erase and
program
operations only
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