AnsweredAssumed Answered

STPM3x power on initialization in UART mode

Question asked by Alexander Shafir on May 9, 2018
Latest reply on Jul 2, 2018 by geppini.frenco

There is some contradiction about STPM32/33/34 POR initialization:

 

"After POR, to ensure a correct initialization, it is necessary to perform a reset of DSP and
communication peripherals through three SYN pulses (see Section 8.6.1 on page 67) and
a single SCS pulse, as shown in the figure below. SCS pulse can be performed before or
after SYN pulses, but minimum startup time before reset (as indicated in Table 5 on
page 17) has to be respected."

 

DocID026142 Rev 7 (37/120)

 

"To ensure a correct initialization of DSP, it is recommended to perform a global reset
through three SYN pulses at startup and before setting configuration bits."

 

DocID026142 Rev 7 (68/120)

 

But at the same time evaluation board STPM32V2 can work in UART mode and no SYN/SCS pulsed at all in this case.

 

Qestions:

- What is the sequence to insure the correct initialization in pure UART mode (RXD/TXD only) and is there any limitations in this case?

 

- Is there any hardware issues that can affect the correct initialization?

Outcomes