RES: ERC32 clock counter incorrect

[Fabrício de Novaes Kucinskis]

Rule number one when reading the ATMEL ERC32 documentation (and also the old
Temic ERC32 chipset): don't trust it!

There are errors concerning the UART Scaler at reset, Signals Description,
many typos... even the index of the TSC695F User's Manual is wrong!

No surprise there is one more error in the RTC Timeout. I hope the
documentation for LEON2 is better.

Fabrício.



-----Mensagem original-----
De: rtems-users-bounces at rtems.org [mailto:rtems-users-bounces at rtems.org] Em
nome de SERONIE VIVIEN, Jacques
Enviada em: segunda-feira, 9 de março de 2009 10:40
Para: rtems-users at rtems.com; GUIBOURET, Damien
Assunto: ERC32 clock counter incorrect


I just checked ATMEL TSC695F (ERC32) documentation. The formula given to
compute the duration of the timer does not require a "-1" on the counter
register (only on the scaler). The documentation states that if the
counter register is set to 0, the timer is stopped (no interrupt is
generated), this would not consistent with the "-1".

But as documentation can contain errors, I would be interested in the
actual tests you performed to find that the "-1" is required.

Regards.

PS: Documentations for LEON2 and LEON3 are differents and clearly
require the "-1" as it is sait that the timer interrupt is generated
when the counter underflows.


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