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STM8AL318A Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce STM8AL318A
Description  device limitations
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STM8AL318A Fiches technique(HTML) 11 Page - STMicroelectronics

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DocID17922 Rev 6
11/18
STM8AL3xxx STM8L052R8 STM8L1xxx6/8
Silicon limitations
17
1.2
System limitations
1.2.1
Default DAC output level when output buffer is enabled
Description
When the DAC is enabled in buffered mode configuration, the output is set to a voltage
which corresponds to the code 0xFFF, whatever the data output register value. The output
recovers the correct voltage as soon as a new data is written into the data holding register.
Workaround
None.
The following software sequence must be executed at the highest speed to limit the duration
of this transient behavior:
DAC->CR1=01; //Enable DAC
DAC->DHR8 = 0x0; //Update the data holding register with 0 (as
an example), or with any other data.
Note:
The DAC in unbuffered mode is not affected by this limitation.
1.2.2
32.768 kHz LSE crystal accuracy may be disturbed by the use of
adjacent I/Os
Description
The activity on the PC4 and PC7 I/Os (input or output) can lead to missing pulses on the low
speed external oscillator (32.768 kHz external crystal).
Workaround
None.
If a high LSE accuracy is required, PC4 and PC7 must be tied to VDD or VSS.
No fix planned for this limitation.
1.2.3
RTC LSE failure can be detected just once after power-on reset
Description
When the CSS on LSE is enabled (CSSEN=1 in CSSLSE_CSR), the CSS on LSE Flag
(CSSF) can be set only once after power-on reset. Consequently, in case of several LSE
perturbations in the application, only the first one can be detected and set the CSSF flag.
Workaround
None.
No fix planned for this limitation.


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