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DS1251YP

4096K NV SRAM with Phantom Clock

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DS1251/DS1251P

4096K NV SRAM with Phantom Clock

PHANTOM CLOCK REGISTER DEFINITON Figure 2

AM/PM/12/24 MODE

Bit 7 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour mode is selected. In the

12-hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20-23 hours).

OSCILLATOR AND RESET BITS

Bits 4 and 5 of the day register are used to control the

and oscillator functions. Bit 4 controls the

(pin 1). When

the

bit is set to logic 1, the

input pin is ignored. When the

bit is set to logic 0, a low input on the

pin will cause the phantom clock to abort data transfer without changing data in the watch registers. Bit 5 controls the

oscillator. When set to logic 1, the oscillator is off. When set to logic 0, the oscillator turns on and the watch becomes operational.

These bits are shipped from the factory set to a logic 1.

ZERO BITS

Registers 1, 2, 3,4,5, and 6 contain one or more bits which will always read logic 0. when writing these locations, either a logic 1 or

0 is acceptable.

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