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DS2417X Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS2417X Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 15 page DS2417 1-WIRE CRC GENERATOR Figure 4 Polynomial = X8 + X5 + X4 + 1 4 of 15 R X2 X1 X0 X8 X7 X6 X5 X4 X3 8TH STAGE 7TH STAGE 6TH STAGE S 2ND STAGE 3RD STAGE 4TH STAGE 5TH STAGE 1ST STAGE INPUT DATA TIMEKEEPING A 32.768kHz 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 DS2417 can generate interrupt pulses to trigger activities that have to occur at regular intervals. The selection of this interval and the on/off control of the 32.768kHz crystal oscillator are done through the device control byte. This byte can be read and written through the Clock Function commands. Device Control Byte 7 6 5 4 3 2 1 0 IE IS2 IS1 IS0 OSC OSC 0 0 Bit 0 - 1 0 No function Bits 0 and 1 are hard-wired to read all 0’s. Bit 2 - 3 OSC Oscillator Enable/Disable These bits control/report whether the 32.768kHz crystal oscillator is running. If the oscillator is running, both OSC bits will read 1. If the oscillator is turned off these bits will all 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. |
Similar Part No. - DS2417X |
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Similar Description - DS2417X |
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