DS1248YP-70 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS1248YP-70

1024K NV SRAM with Phantom Clock

Maxim Integrated 

DS1248/DS1248P 1024K NV SRAM with Phantom Clock

Figure 2. Phantom Clock Register Definition

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 20-hour bit (20–23 hours).

OSCILLATOR AND RESET BITS

Bits 4 and 5 of the day register are used to control the RST and oscillator functions. Bit 4 controls the

RST (pin 1). When the RST bit is set to logic 1, the RST input pin is ignored. When the RST bit is set to

logic 0, a low input on the RST 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.

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