DS1315
outside the memory block can be interleaved with
CEI
cycles without interrupting the pattern recognition
sequence or data transfer sequence to the Time Chip.
A standard 32.768 kHz quartz crystal can be directly connected to the DS1315 via pins 1 and 2 (X1, X2).
The crystal selected for use should have a specified load capacitance (C
L
) of 6 pF. For more information
on crystal selection and crystal layout considerations, please consult Application Note 58, 鈥淐rystal
Considerations with Dallas Real Time Clocks.鈥?/div>
TIME CHIP COMPARISON REGISTER DEFINITION
Figure 2
NOTE:
The pattern recognition in Hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being
accidentally duplicated and causing inadvertent entry to the Phantom Time Chip are less than 1 in 10
19
.
4 of 21
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