DS12887 a Periodic Interrupt enable (pel)bit is cleared to o B.Alarm Interrupt Enable (AIE)bit is cleared to 0. C.Update Ended Interrupt Flag (UF)bit is cleared to 0. (IRQF)bit is cleared to F The device is not accessible until RESET is returned high G.Alarm Interrupt Flag(AF)bit is cleared to 0. H IRQ pin is in the high impedance state. L Square wave Output enable SOwe bit is cleared to o Update Ended Inte errupt Enable(UIE)is cleared to 0. In a typical application RESET can be connected to Vcc.This connection will allow the DS12887 to go in and out of power fail without affecting any of the control registers. s map the DS12887 is sho for control and status.All 128 bytes can be directly written or read except for the following: Registers C and D are read-only. 2.Bit 7 of Register A is read-only 3.The high order bit of the seconds byte is read-only The contents of four registers(A,B,C,and D)are described in the"Registers"section. ADDRESS MAP DS12887 Figure 2 SECONOS 14 MNUTES ALARM HOURS ALARM DAY OF THE WEEN DAY OF THE MONTH MONTH YEAR REG/STERA REGISTERB 5of19 DS12887 5 of 19 A. Periodic Interrupt Enable (PEI) bit is cleared to 0. B. Alarm Interrupt Enable (AIE) bit is cleared to 0. C. Update Ended Interrupt Flag (UF) bit is cleared to 0. D. Interrupt Request Status Flag (IRQF) bit is cleared to 0. E. Periodic Interrupt Flag (PF) bit is cleared to 0. F. The device is not accessible until RESET is returned high. G. Alarm Interrupt Flag (AF) bit is cleared to 0. H. IRQ pin is in the high impedance state. I. Square Wave Output Enable ( SQWE ) bit is cleared to 0. J. Update Ended Interrupt Enable (UIE) is cleared to 0. In a typical application RESET can be connected to VCC. This connection will allow the DS12887 to go in and out of power fail without affecting any of the control registers. ADDRESS MAP The address map of the DS12887 is shown in Figure 2. The address map consists of 114 bytes of user RAM, 10 bytes of RAM that contain the RTC time, calendar, and alarm data, and 4 bytes which are used for control and status. All 128 bytes can be directly written or read except for the following: 1. Registers C and D are read–only. 2. Bit 7 of Register A is read–only. 3. The high order bit of the seconds byte is read–only. The contents of four registers (A,B,C, and D) are described in the “Registers” section. ADDRESS MAP DS12887 Figure 2