STM32F102XX datasheet(13/41 Pages) STMICROELECTRONICS

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DocID14574 Rev 13

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STM32F10xx8 STM32F10xxB

STM32F10xx8 and STM32F10xxB silicon limitations

2.1

Voltage glitch on ADC input 0

Description

A low-amplitude voltage glitch may be generated (on ADC input 0) on the PA0 pin, when the

ADC is converting with injection trigger. It is generated by internal coupling and

synchronized to the beginning and the end of the injection sequence, whatever the

channel(s) to be converted.

The glitch amplitude is less than 150 mV with a typical duration of 10 ns (measured with the

I/O configured as high-impedance input and left unconnected). If PA0 is used as a digital

output, this has no influence on the signal. If PA0 is used has a digital input, it will not be

detected as a spurious transition, providing that PA0 is driven with an impedance lower than

5 k

Ω. This glitch does not have any influence on the remaining port A pin or on the ADC

conversion injection results, in single ADC configuration.

When using the ADC in dual mode with injection trigger, and in order to avoid any side

effect, it is advised to distribute the analog channels so that Channel 0 is configured as an

injected channel.

Workaround

None.

2.2

Flash memory read after WFI/WFE instruction

Conditions

•

Flash prefetch on

•

Flash memory timing set to 2 wait states

•

FLITF clock stopped in Sleep mode

Description

If a WFI/WFE instruction is executed during a Flash memory access and the Sleep duration

is very short (less than 2 clock cycles), the instruction fetch from the Flash memory may be

corrupted on the next wakeup event.

Workaround

When using the Flash memory with two wait states and prefetch on, the FLITF clock must

not be stopped during the Sleep mode – the FLITFEN bit in the RCC_AHBENR register

must be set (keep the reset value).

2.3

Debug registers cannot be read by user software

Description

The DBGMCU_IDCODE and DBGMCU_CR debug registers are accessible only in debug

mode (not accessible by the user software). When these registers are read in user mode,

the returned value is 0x00.

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