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SH3002 Datasheet(PDF) 10 Page - Semtech Corporation |
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SH3002 Datasheet(HTML) 10 Page - Semtech Corporation |
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10 / 22 page  SH3002 MicroBuddy™ SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation 10 V1.20 www.semtech.com Periodic Interrupt / Wakeup Timer Simple and versatile, the Periodic Interrupt / Wakeup Timer can be used to create very accurate recurring interrupts for use by the host micro. With some minimal software support from the host processor, it can also be used to create alarms, with practically unlimited duration. While the timer is running, the host processor can be halted, consuming no energy. The interrupt wakes up the processor, which can perform the requisite task and go back to sleep, until the next periodic interrupt. This mode of operation can achieve extremely low average power consumption. A 32-bit counter clocked by 32.768 kHz, producing a minimum interval of 30.5 µs and the maximum interval of 36.4 hours, creates the Timer. After reset, the Timer is stopped until the new value for the time interval is written into the 4-byte Time Interval register. When the least significant byte (LSB) is written, the whole value is moved to the Time Interval latch, the counter is reset and starts to increment with the 32.768 kHz clock. When the 32-bit comparator detects a match, an interrupt is generated and the counter is reset and starts the next timing cycle. Although the counter cannot be written to, the current value from the counter can be read at any time. The whole 32-bit value is loaded into the 32-bit Current Timer Value latch when the least significant byte is read. This prevents errors stemming from the finite time between the readings of individual bytes of the current value. Auxiliary functions Voltage Regulator Pin VREG can be used as a nominal 2.20 V reference voltage or a supply source for small loads (<2 mA). A bypass capacitor might be necessary between this pin and VSS if the load generates large current transients or a low ripple reference is required. 14 Figure 6. Periodic Interrupt / Wakeup timer IO/INT 32-bit Time Interval 32-bit Counter 32-bit Comparator 32-bit Latch Interrupt Logic Serial I/O RESET LSB MSB 32-bit Latch LOAD LOAD Current Timer Value LSB MSB 32.768 kHz |
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