Real Time Clock Adjust Rslogix 500 Serial SPI Interface

A simple serial SPI interface makes DS1302 communicate and interact with any microprocessor or microcontroller having an SPI communication interface.

There are two forms of time indication i.e.

Retention of data and clock information can only take 1W at most.

Synchronous serial communication is used for connecting this RTC chip with a microprocessor.

RST (reset), IO (data line) and SCLK (serial clock) are the three terminals required for communication with DS1302.

Single byte or multiple byte mode are utilized for data transferring to or from clock or RAM.

DS1302 actually operates on any of the two i.e.

V CC1 or V CC2 depending on the magnitude of a higher one.

The input at this pin should be high during a read or write.

It is bi-directional in nature provided communication is occurring through a three-wire SPI interface.

V CC2 and V CC1 depending on the magnitude of a higher one.

The MSB determines whether writes to DS1302 are possible or not.

If this MSB i.e. bit no 7 is 1 writes to DS1302 is enabled and if its logic 0 writes to DS1302 is disabled.

RAM data. Bit no.

Logic 0 at bit 0 I.e.

LSB shows wrote operation and logic 1 shows read operation.

Instead of purchasing this IC alone, there are many RTC modules available in the market.

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