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SH7052 bảng dữ liệu(PDF) 439 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7052 bảng dữ liệu(HTML) 439 Page - Renesas Technology Corp

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Section 12 Watchdog Timer (WDT)
12.1
Overview
The watchdog timer (WDT) is a 1-channel timer for monitoring system operations. If a system
encounters a problem (crashes, for example) and the timer counter overflows without being
rewritten correctly by the CPU, an overflow signal (
WDTOVF) is output externally. The WDT
can simultaneously generate an internal reset signal for the entire chip.
When the watchdog function is not needed, the WDT can be used as an interval timer. In the
interval timer operation, an interval timer interrupt is generated at each counter overflow. The
WDT is also used in recovering from standby mode.
12.1.1
Features
The WDT has the following features:
• Works in watchdog timer mode or interval timer mode
• Outputs WDTOVF in watchdog timer mode
When the counter overflows in watchdog timer mode, overflow signal
WDTOVF is output
externally. It is possible to select whether to reset the chip internally when this happens. Either
the power-on reset or manual reset signal can be selected as the internal reset signal.
• Generates interrupts in interval timer mode
When the counter overflows, it generates an interval timer interrupt.
• Clears software standby mode
• Works with eight counter input clocks



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