TMS320F28335: Possible Incorrect Operation of XINTF Module After Power Up_memory: possible incorrect operation of xintf modu-优快云博客

本文档描述了TMS320F28335处理器在访问XINTF内存时偶尔出现挂起的问题，并提供了解决方案。此问题仅在上电复位后发生，其他类型的复位不会导致该问题。文中给出了通过软件触发看门狗复位来规避这一问题的具体步骤。

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Failure Description：TMS320F28335would be hang-up occasionally if accessing to XINTF memory, when Hollysys teststhe third version PCBA. This issue can be found from sprz272k.pdf.

Revision(s) Affected:0, A

Details：TheXINTF module may not get reset properly upon power up. When this happens,

accesses to XINTFaddresses may cause the CPU to hang. This issue occurs only upon

power up. It does nothappen for other resets such as a reset initiated by the watchdog

or an external (warm) reset using the XRS pin.

Workaround：Aftercoming out of reset, software should force a watchdog (WD) reset if WDFLAG = 0 inthe WDCR register. WDFLAG = 0 implies that an external reset occurred, forexample, a power-on reset. After exiting the WD reset, WDFLAG will be 1. Inthis case, software should clear the WDFLAG bit before continuing normal codeexecution. This issue affects only the XINTF module.

Reference code：
   EALLOW;
if(!(SysCtrlRegs.WDCR &0x0080)) // if there is a watchdog reset
{
   SysCtrlRegs.WDCR = 0x00A8; // enable watchdog
   SysCtrlRegs.WDCR = 0x0000; // reset
}
SysCtrlRegs.WDCR = 0x00E8;//disable watchdog
EDIS;