vmp (11.12.2006 11:40, просмотров: 1) ответил General на Вроде с САМами какой-то гемор был, типа не рекомендуем, неустранимая ошибка??Атмелы уже разобрались в ситуации, написали новую эррату и опубликовали в rev.G даташита. 39.3.13 Watchdog Timer (WDT)
39.3.13.1 WDT: The Watchdog Timer May Lock the Device in a Reset State
Under certain rare circumstances, if the Watchdog Timer is used with the Watchdog Reset
enabled (WDRSTEN set at 1), the Watchdog Timer may lock the device in a reset state when
the user restarts the watchdog (WDDRSTT). The only way to recover from this state is a poweron
reset. The issue depends on the values of WDD and WDV in the WDT_MR register.
Problem Fix/Workaround
Two workarounds are possible.
1. Either do not use the Watchdog Timer with the Watchdog Reset enabled (WDRSTEN
set at 1),
2. or set WDD to 0xFFF and in addition use only one of the following values for WDV:
0xFFF, 0xDFF, 0xBFF, 0x9FF, 0x7FF, 0x77F, 0x6FF, 0x67F, 0x5FF, 0x57F, 0x4FF, 0x47F,
0x3FF, 0x37F, 0x2FF, 0x27F, 0x1FF, 0x1BF, 0x17F, 0x13F, 0x0FF, 0x0DF, 0x0BF, 0x09F,
0x07F, 0x06F, 0x05F, 0x04F, 0x03F, 0x037, 0x02f, 0x027, 0x01F, 0x01B, 0x017, 0x013 and
0x00F.