DS1244WP-120IND 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1244WP-120IND

256k NV SRAM with Phantom Clock

Dallas Semiconductor -> Maxim Integrated 

Figure 2. PHANTOM CLOCK REGISTER DEFINITION

DS1244/DS1244P

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 RESET and oscillator functions. Bit 4 controls the

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

bit is set to logic 0, a low input on the RESET 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 that always read logic 0. When writing these

locations, either a logic 1 or 0 is acceptable.

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