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DS80C323-QNR Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS80C323-QNR Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 175 page High-Speed Microcontroller User’s Guide 5 of 175 POWER MONITOR Some members of the High-Speed Microcontroller family incorporate a band-gap reference and analog circuitry to monitor the power supply conditions. VCC begins to drop out of tolerance, the Power Monitor will issue an optional early warning Power-fail interrupt. If power continues to fall, the Power Monitor will invoke a reset condition. This will remain until power returns to normal operating voltage. The Power Monitor also functions on power-up, holding the microcontroller in a reset state until power is stable. INTERRUPTS The High-Speed Microcontroller is capable of evaluating a number of interrupt sources simultaneously. Each version of the High-Speed Microcontroller provides a different number of interrupt sources. Each interrupt has an associated interrupt vector, flag, priority, and enable. These interrupts can be globally enabled or disabled. TIMING CONTROL The High-Speed Microcontroller provides an on-chip oscillator for use with an external crystal. This can be bypassed by injecting a clock source into the XTAL 1 pin. The clock source is used to create machine cycle timing (four clocks), ALE, PSEN , Watchdog, Timer, and serial baud rate timing. In addition, some devices incorporate an on-chip ring oscillator which can be used to provide an approximately 2-4 MHz clock source. REAL-TIME CLOCK The DS87C530 incorporates a real-time clock (RTC), which is accessed via SFR locations. The RTC is divided into hour, minute, second, and subsecond registers, and also incorporates a 65536 day calendar. Alarm registers allow the RTC to issue interrupts at a specific time once a day, or as a recurring alarm every hour, minute or second. An external watch crystal and lithium power source allow the processor to maintain timekeeping in the absence of VCC. FEATURE SUMMARY The High-Speed Microcontroller family offers a combination of features and peripherals as shown in Table 3-1. This User’s Guide is designed as a comprehensive guide covering all features available in the High-Speed Microcontroller family. The designer should investigate the specific data sheet to determine which features are available on a particular device. Detailed information about newer members of the product family may be provided in separate documents until they can be assimlilated into the High-Speed Microcontroller User’s Guide. |
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