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ISL12058 Datasheet(PDF) 11 Page - Renesas Technology Corp |
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ISL12058 Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 20 page  ISL12058 FN6756 Rev 1.00 Page 11 of 20 Dec 10, 2015 FREQUENCY OUT CONTROL BITS (FO <1:0>) These bits select the output frequency at the IRQ/FOUT pin. IRQE must be set to “0” for frequency output at the IRQ/FOUT pin. Refer to Table 5 for frequency selection. ALARM ENABLE BITS (ALM1E, ALM2E) This bit enables/disables the Alarm1 and Alarm2 function. When the ALM1E bit is set to “1”, the Alarm1 function is enabled. When the ALM1E is cleared to “0”, the alarm function is disabled. ALM1E bit is set to “0” at power-up. When the ALM2E bit is set to “1”, the Alarm2 function is enabled. When the ALM2E is cleared to “0”, the alarm function is disabled. ALM2E bit is set to “0” at power-up. NOTE: The Alarm1 has hardware function via the IRQ/FOUT pin. Alarm2 does not have hardware interrupt function. Alarm1 Registers Addresses [Address 0Ch to 11h] The Alarm1 register bytes are set up identical to the RTC register bytes, except that the MSB of each byte functions as an enable bit (enable = “1”). These enable bits specify which alarm registers (seconds, minutes, etc) are used to make the comparison. Note that there is no alarm byte for year. When all the enable bits are set to “0” with ALM1E set to “1”, the Alarm 1 will triggered once a second. The Alarm1 function works as a comparison between the Alarm1 registers and the RTC registers. As the RTC advances, the Alarm1 will be triggered once a match occurs between the Alarm1 registers and the RTC registers. Any one Alarm1 register, multiple registers, or all registers can be enabled for a match. To clear an Alarm1, the A1F status bit can be set to “0” with a write or use the ARST bit auto reset function. Following is example of Alarm1 Interrupt. Example – A single alarm will occur on January 1 at 11:30am. A. Set Alarm1 registers as follows: 1 1 Alarm 1 Interrupt TABLE 5. FREQUENCY SELECTION OF IRQ/FOUT PIN WITH FO1 AND FO0 BITS FO1 FO0 FREQUENCY, FOUT (Hz) COMMENT 1 1 32768 Free running crystal clock 1 0 8192 Free running crystal clock 0 1 4096 Free running crystal clock 0 0 1 Sync. at RTC write TABLE 4. FUNCTION SELECTION OF IRQ/FOUT PIN WITH A1E AND IRQE BITS (Continued) A1E IRQE IRQ/FOUT FUNCTION TABLE 6. ALARM1 INTERRUPT WITH ENABLE BITS SELECTION A1M1 A1M2 A1M3 A1M4 A1M5 A1M6 ALARM1 Interrupt 00 000 0 Every Second 1 0 0 0 0 0 Match Second 01 000 0 Match Minute 0 0 1 0 0 0 Match Hour 00 010 0 Match Date 00 001 0 Match Month 00 000 1 Match Day 1 1 0 0 0 0 Match Second and Minute 1 0 1 0 0 0 Match Second and Hour 1 1 1 0 0 0 Match Second, Minute, and Hour . . . . . . . . . . . . . . . . . . 00 011 1 Match Date, Month, and Day 1 0 0 1 1 1 Match Second, Date, Month, and Day . . . . . . . . . . . . . . . . . . . . 01 111 1 Match MInute, Hour, Date, Month, and Day 1 1 1 1 1 1 Match Second, MInute, Hour, Date, Month, and Day ISL12058 |
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