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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87591L датащи(PDF) 169 Page - National Semiconductor (TI) |
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PC87591L датащи(HTML) 169 Page - National Semiconductor (TI) |
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169 / 437 page  Embedded Controller Modules (Continued) Revision 1.07 169 www.national.com 4.10.4 Usage Hints The TWD protects WATCHDOG operation from software tampering. To achieve the highest level of protection, proceed as follows: 1. Program the TWDT0 pre-scale and TMWT0 timers to the desired values. 2. Configure the WATCHDOG clock to use T0IN or T0OUT using WDCT0I bit in TWCFG register. 3. Program the WDCTL to the maximum period between WATCHDOG touch operations. Note that from this point, the WATCHDOG starts operating and must be touched periodically to prevent a WATCHDOG error signal. 4. Configure the WATCHDOG to use data match, and lock all the TWD configuration and setting registers by setting bits 0 through 4 and bit 6 of the TWCFG. 5. Touch the WATCHDOG by writing 5C16 to WDSDM at the appropriate rate (i.e., no more than once every WATCHDOG clock cycle and no less than the period programed to WDCTL). |
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