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SY10H841ZCTR Datasheet Watchdog Software Considerations tWifAX8231MAX824) One way to help the watchdog timer monitor software execution more closely is to set and reset the watchdog input at different points in the program, rather than pulsing the watchdog input high-low-high or low-high- low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watchdog from timing out. Figure 5 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the begin- ning of the program, set low at the beginning of every subroutine or loop, then set high again when the pro- gram returns to the beginning. If the program should hang in any subroutine, the problem would quickly be corrected, since the l/0 is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued. As described in the Watchdog Input Current section, this scheme results in higher time average WDI input current than does leaving WDI low for the majority of the timeout period and periodically pulsing it low-high-low. SY10H841ZCTR Price
SY10H841ZCTR on stock Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability 1. The Data Ready line can drive an optional LED which indicates when the buffer has valid data available. This is a useful diagnostic tool. 2. The Send Data input is tested after the transmission of each character and therefore must be held high for the total duration of transmission (Eight characters) 3. The error checking (CRC) ensures (with 99.9% certainty) that any message received and flagged by Data Ready will be error free. However if the CRC fails for any reason the message is lost forever. In simplex (one way only) systems such as these it may therefore be prudent to send the message multiple times. |
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