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IDT1339-31DVGI Datasheet(PDF) 8 Page - Integrated Device Technology |
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IDT1339-31DVGI Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 26 page IDT1339 REAL-TIME CLOCK WITH SERIAL I2C INTERFACE RTC IDT® REAL-TIME CLOCK WITH SERIAL I2C INTERFACE 8 IDT1339 REV S 031014 Table 4. Alarm Mask Bits Special-Purpose Registers The IDT1339 has two additional registers (control and status) that control the RTC, alarms, and square-wave output. Control Register (0Eh) Bit 7: Enable Oscillator (EOSC). This bit when set to logic 0 starts the oscillator. When this bit is set to a logic 1, the oscillator is stopped. This bit is enabled (logic 0) when power is first applied. Bit 5: Battery-Backed Square-Wave and Interrupt Enable (BBSQI). This bit when set to a logic 1 enables the square wave or interrupt output when VCC is absent and the IDT1339 is being powered by the VBACKUP pin. When BBSQI is a logic 0, the SQW/INT pin goes high impedance when VCC falls below the power-fail trip point. This bit is disabled (logic 0) when power is first applied. Bits 4 and 3: Rate Select (RS2 and RS1). These bits control the frequency of the square-wave output when the square wave has been enabled. Table 5 shows the square-wave frequencies that can be selected with the RS bits. These bits are both set to logic 1 (32 kHz) when power is first applied. DY/DT Alarm 1 Register Mask Bits (Bit 7) Alarm Rate A1M4 A1M3 A1M2 A1M1 X 1111 Alarm once per second. X 1110 Alarm when seconds match. X 1100 Alarm when minutes and seconds match. X 1000 Alarm when hours, minutes, and seconds match. 0 0000 Alarm when date, hours, minutes, and seconds match. 1 0000 Alarm when day, hours, minutes, and seconds match. DY/DT Alarm 2 Register Mask Bits (Bit 7) Alarm Rate A2M4 A2M3 A2M2 X 1 1 1 Alarm once per minute (00 sec. of every min.). X 1 1 0 Alarm when minutes match. X 1 0 0 Alarm when hours and minutes match. 0 0 0 0 Alarm when date, hours, and minutes match. 1 0 0 0 Alarm when day, hours, and minutes match. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 EOSC 0 BBSQI RS2 RS1 INTCN A2IE A1IE |
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