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COP8CCR9IMT7/NOPB Datasheet(PDF) 83 Page - Texas Instruments |
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COP8CCR9IMT7/NOPB Datasheet(HTML) 83 Page - Texas Instruments |
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83 / 111 page  COP8CBR9, COP8CCR9, COP8CDR9 www.ti.com SNOS535I – OCTOBER 2000 – REVISED MARCH 2013 1/tC < 10 Hz—Ensured clock rejection. Table 5-28. WATCHDOG Service Actions Key Window Clock Action Data Data Monitor Match Match Match Valid Service: Restart Service Window Don't Care Mismatch Don't Care Error: Generate WATCHDOG Output Mismatch Don't Care Don't Care Error: Generate WATCHDOG Output Don't Care Don't Care Mismatch Error: Generate WATCHDOG Output 5.16.3 WATCHDOG AND CLOCK MONITOR SUMMARY The following salient points regarding the WATCHDOG and CLOCK MONITOR should be noted: • Both the WATCHDOG and CLOCK MONITOR detector circuits are inhibited during RESET. • Following RESET, the WATCHDOG and CLOCK MONITOR are both enabled, with the WATCHDOG having the maximum service window selected. • The WATCHDOG service window and CLOCK MONITOR enable/disable option can only be changed once, during the initial WATCHDOG service following RESET. • The initial WATCHDOG service must match the key data value in the WATCHDOG Service register WDSVR in order to avoid a WATCHDOG error. • Subsequent WATCHDOG services must match all three data fields in WDSVR in order to avoid WATCHDOG errors. • The correct key data value cannot be read from the WATCHDOG Service register WDSVR. Any attempt to read this key data value of 01100 from WDSVR will read as key data value of all 0's. • The WATCHDOG detector circuit is inhibited during both the HALT and IDLE modes. • The CLOCK MONITOR detector circuit is active during both the HALT and IDLE modes. Consequently, the device inadvertently entering the HALT mode will be detected as a CLOCK MONITOR error (provided that the CLOCK MONITOR enable option has been selected by the program). Likewise, a device with WATCHDOG enabled in the Option but with the WATCHDOG output not connected to RESET, will draw excessive HALT current if placed in the HALT mode. The clock Monitor will pull the WATCHDOG output low and sink current through the on-chip pull-up resistor. • The WATCHDOG service window will be set to its selected value from WDSVR following HALT. Consequently, the WATCHDOG should not be serviced for at least 2048 Idle Timer clocks following HALT, but must be serviced within the selected window to avoid a WATCHDOG error. • The IDLE timer T0 is not initialized with external RESET. • The user can sync in to the IDLE counter cycle with an IDLE counter (T0) interrupt or by monitoring the T0PND flag. The T0PND flag is set whenever the selected bit of the IDLE counter toggles (every 4, 8, 16, 32 or 64k Idle Timer clocks). The user is responsible for resetting the T0PND flag. • A hardware WATCHDOG service occurs just as the device exits the IDLE mode. Consequently, the WATCHDOG should not be serviced for at least 2048 Idle Timer clocks following IDLE, but must be serviced within the selected window to avoid a WATCHDOG error. • Following RESET, the initial WATCHDOG service (where the service window and the CLOCK MONITOR enable/disable must be selected) may be programmed anywhere within the maximum service window (65,536 instruction cycles) initialized by RESET. Note that this initial WATCHDOG service may be programmed within the initial 2048 instruction cycles without causing a WATCHDOG error. • When using any of the ISP functions in Boot ROM, the ISP routines will service the WATCHDOG within the selected upper window. Upon return to flash memory, the WATCHDOG is serviced, the lower window is enabled, and the user can service the WATCHDOG anytime following exit from Boot ROM, but must service it within the selected upper window to avoid a WATCHDOG error. Copyright © 2000–2013, Texas Instruments Incorporated Functional Description 83 Submit Documentation Feedback Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9 |
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