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CP3SP33SMS/NOPB Datasheet(PDF) 317 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 317 Page - Texas Instruments |
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317 / 407 page  CP3SP33 www.ti.com SNOSCW5 – MAY 2013 If the TWCFG.WDSDME bit is set, the Watchdog is serviced by writing the value 5Ch to the Watchdog Service Data Match (WDSDM) register. This reloads the Watchdog counter with the value previously programmed into the WDCNT register. The counter then continues counting down from that value. A Watchdog error signal is generated by any of the following events: • The Watchdog serviced too late. • The Watchdog serviced too often. • The WDSDM register is written with a value other than 5Ch when WDSDM type servicing is enabled (TWCFG.WDSDME = 1). A Watchdog error condition resets the device. 31.3.1 Register Locking The Timer and Watchdog Configuration (TWCFG) register is used to set the Watchdog configuration. It controls the Watchdog clock source (T0IN or T0OUT), the type of Watchdog servicing (using WDCNT or WDSDM), and the locking state of the TWCFG, TWCPR, TIMER0, T0CSR, and WDCNT registers. A register that is locked cannot be read or written. A write operation is ignored and a read operation returns unpredictable results. If the TWCFG register is itself locked, it remains locked until the device is reset. Any other locked registers also remain locked until the device is reset. This feature prevents a run- away program from tampering with the programmed Watchdog function. 31.3.2 Power Save Mode Operation The Timer and Watchdog Module is active in both the Power Save and Idle modes. The clocks and counters continue to operate normally in these modes. The WDSDM register is accessible in the Power Save and Idle modes, but the other TWM registers are accessible only in the Active mode. Therefore, Watchdog servicing must be carried out using the WDSDM register in the Power Save or Idle mode. In the Halt mode, the entire device is frozen, including the Timer and Watchdog Module. On return to Active mode, operation of the module resumes at the point at which it was stopped. NOTE After a restart or Watchdog service through WDCNT, do not enter Power Save mode for a period equivalent to 5 Slow Clock cycles. 31.4 TWM Registers The TWM registers controls the operation of the Timing and Watchdog Module. There are six such registers: Table 31-1. TWM Registers NAME ADDRESS DESCRIPTION TWCFG FF A000h Timer and Watchdog Configuration Register TWCP FF A004h Timer and Watchdog Clock Prescaler Register TWMT0 FF A008h TWM Timer 0 Register T0CSR FF A00Ch TWMT0 Control and Status Register WDCNT FF A010h Watchdog Count Register WDSDM FF A014h Watchdog Service Data Match Register Copyright © 2013, Texas Instruments Incorporated Timing and Watchdog Module 317 Submit Documentation Feedback Product Folder Links :CP3SP33 |
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