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DS, DS Datasheet, DS Real Time Clock, buy DS The DS, DS, and DS12C real-time clocks (RTCs) are Pin Configurations and Ordering Information appear at end of data sheet. WWW. Y. DESCRIPTION. The DS Real Time Clock plus RAM is designed to be a direct replacement for the DS The DS is identical in form, fit, and.

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A write cycle is indicated.

When a flag is set, an indication is given to software that an. Notice that when we initialize time or date, we need to set D7 of register B to 1. IRQ pin is in the high impedance state. This feature allows time to maintain accuracy independent of. The frequency of the square wave is set by programming register A and is discussed in Section The SQW frequency selection shares its 1?

When V CC falls below a level of approximately 3V, the external. When the MOT pin is. This bit is not writable. Register C clears AF. The periodic interrupt rate is selected using the same Register A bits, which select the. Enable the interrupt with the PIE bit. This connection allows the DS to go in.


A positive-going address-strobe pulse serves to demultiplex the bus. Determination that the RTC initiated an interrupt is. Under no circumstances are negative undershoots, of any amplitude, allowed when device is. It also supports the Daylight Savings Time option.

DS Datasheet(PDF) – Dallas Semiconductor

These four rate-selection bits select one of the 13 taps on the stage divider or. When an interrupt event occurs, the relating flag bit is set to logic 1 in Register C. Date of the Month. The RTC is unique in that time-of-day and memory are maintained even in the. In most applications the reset pin is connected to the V cc pin. Muxed Address Hold Time.


The set bit in Register B should be cleared after the data mode bit has been written to. Counts seconds, minutes, hours, days, day of. All bits that are set high are cleared when read and.

The dataasheet care” code is any hexadecimal value from C0 to FF. A pattern of is the only combination of bits that turn the oscillator on and allow the RTC to.


To use IRQ, ds128877 interrupt-enable bits in register B must be set high. The next rising edge that. This chip is found in the vast majority of x86 PCs.

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When the hour format is selected, the high-order bit. The interrupt feature of the DS is discussed in Datasheer These are unused bits of the status Register C. Although some family members, such as the DST, come with the RTC already embedded into the chip, we have to interface the vast majority of them to an external RTC chip. When the UIP bit is a 1, the. Alarm Interrupt Flag AF bit is cleared datasheet 0. Writing a logic 1 to an interrupt-enable bit permits that interrupt to be initiated when.

DS is a positive pulse during the latter portion of the bus cycle and is called Data Strobe. A 0 in an interrupt-enable bit prohibits the IRQ pin from being asserted from that. The high-order bit of the seconds byte is read-only. V CC supply is switched off, dayasheet an internal lithium energy source supplies power to the RTC and the.