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AS3524 数据表(PDF) 39 Page - ams AG |
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AS3524 数据表(HTML) 39 Page - ams AG |
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39 / 124 page  AS3524 C21 / C22 austriamicrosystems Data Sheet, Confidential © 2003-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.11 39 - 124 5.3.2 Watchdog Unit The watchdog unit provides a way of recovering from software crashes. The watchdog clock is used to generate a regular interrupt (WDOGINT), depending on a programmed value. The watchdog monitors the interrupt and asserts a reset signal (WDOGRES) if the interrupt remains unserviced for the entire programmed period. You can enable or disable the watchdog unit as required. Clock reference for the watchdog is PCLK divided by 256. Figure 16 watchdog unit 5.3.2.1 Watchdog register descriptions Table 19 Watchdog Registers Register Name Base Address Offset Note WDT_LOAD AS3525_WDT_BASE 0x00 load register WDT_VALUE AS3525_WDT_BASE 0x04 counter current value WDT_CONTROL AS3525_WDT_BASE 0x08 control register WDT_INTCLR AS3525_WDT_BASE 0x0C Interrupt clear register WDT_RIS AS3525_WDT_BASE 0x10 Raw interrupt status register WDT_MIS AS3525_WDT_BASE 0x14 Masked interrupt status register WDT_LOCK AS3525_WDT_BASE 0xC00 Lock register WDT_PERIPHID0 AS3525_WDT_BASE 0xFE0 Watchdog peripheral ID 0 register WDT_PERIPHID1 AS3525_WDT_BASE 0xFE4 Watchdog peripheral ID 1 register WDT_PERIPHID2 AS3525_WDT_BASE 0xFE8 Watchdog peripheral ID 2 register WDT_PERIPHID3 AS3525_WDT_BASE 0xFEC Watchdog peripheral ID 3 register WDT_PCELLID0 AS3525_WDT_BASE 0xFF0 Watchdog primecell ID 0 register WDT_PCELLID1 AS3525_WDT_BASE 0xFF4 Watchdog primecell ID 1 register WDT_PCELLID2 AS3525_WDT_BASE 0xFF8 Watchdog primecell ID 2 register WDT_PCELLID3 AS3525_WDT_BASE 0xFFC Watchdog primecell ID 3 register Watchdog load register, WdogLoad This is a 32-bit register containing the value from which the counter is to decrement. When this register is written to, the count is immediately restarted from the new value. The minimum valid value for WdogLoad is one. |
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