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DS2415V Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS2415V Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 14 page DS2415 4 of 14 TIMEKEEPING A 32.768 kHz crystal oscillator is used as the time base for the real time clock counter. The oscillator can be turned on or off under software control. The oscillator must be on for the real time clock to function. The real time clock counter is double-buffered. This allows the master to read time without the data changing while it is being read. To accomplish this, a snapshot of the counter data is transferred to a read/write buffer, which the user accesses. DEVICE CONTROL BYTE The on/off control of the 32.768 kHz crystal oscillator is done through the device control byte. This byte can be read and written through the Clock Function commands. Device Control Byte 7 65432 1 0 U4 U3 U2 U1 OSC OSC 0 0 Bit 0 - 1 0 No function Bits 0 and 1 are hard-wired to read all 0s. Bit 2 - 3 OSC Oscillator Enable/Disable These bits control/report whether the 32.768 kHz crystal oscillator is running. If the oscillator is running, both OSC bits will read 1. If the oscillator is turned off these bits will read 0. When writing the device control byte both occurrences of the OSC bit should have identical data. Otherwise the value in bit address 3 (bold) takes precedence. Bit 4 - 7 Un General-purpose user flags These bits have no particular function within the chip. They can be read and written under the control of the application software and remain non-volatile as long as there is sufficient voltage at the VDD pin. If the DS2415 is located inside a battery pack, for example, these bits could convey data on the charging status from the charging station to the equipment that uses the battery. Real time Clock The real time clock is a 32-bit binary counter. It is incremented once per second. The real time clock can accumulate 136 years of seconds before rolling over. Time/date is represented by the number of seconds since a reference point, which is determined by the user. For example, 12:00 a.m., January 1, 1970 could be a reference point. CLOCK FUNCTION COMMANDS The “Clock Function Flow Chart” (Figure 5) describes the protocols necessary for accessing the real time clock. With only 4 bytes of real time clock and one control byte the DS2415 does not provide random access. Reading and writing always starts with the device control byte followed by the least significant byte of the time data. |
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