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PC87591L bảng dữ liệu(PDF) 169 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện PC87591L
Giải thích chi tiết về linh kiện  LPC Mobile Embedded Controllers
PDF  437 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87591L bảng dữ liệu(HTML) 169 Page - National Semiconductor (TI)

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Embedded Controller Modules (Continued)
Revision 1.07
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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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