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SH3003IMLTR Datasheet(PDF) 21 Page - Semtech Corporation |
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SH3003IMLTR Datasheet(HTML) 21 Page - Semtech Corporation |
21 / 30 page ©2006 Semtech Corp. www.semtech.com POWER MANAGEMENT 21 SH3003 POWER MANAGEMENT Interrupt and Serial Interface (continued) Application Information (continued) Interrupt Interface The serial communications line to the SH3003 (Pin 14, IO/Int) also serves as the interrupt to the host microcontroller. The polarity of the interrupt is software programmable using the interrupt polarity bit (bit 6) of the IPol_RCtune register (R0x11). This pin is asserted for four cycles of CLKout, and then returns to the inactive state. The interrupt line is used by the Periodic Interrupt/Wake-up Timer to interrupt the host when it reaches its end of count. CLKOUT Frequency Minimum Bit Period (host synchronous to CLKOUT) Minimum Bit Period (host Asynchronous to CLKOUT) Maximum Bit Period 16MHz 250ns 3.25μs 63.9μs 8MHz 500ns 6.5μs 127μs 2MHz 2μs26μs511μs Table 3 - Minimum/Maximum Serial Bit Timing |
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