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However, the driver running under Linux only supports the chip in the basic functions of setting the time, reading the current time, and accessing internal SRAM. The chip also offers the option of fine tuning the seconds interval in microsecond steps.
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Unlike other RTC chips, the MCP79410 stores time stamps from the last power outage and the subsequent restoration of power. The MCP79410 offers two independent alarm settings that you can set for up to one year into the future. In this case, I'll use the MCP79410, an RTC chip form Microchip Technology. The computer can then convert the oscillator output to a human-readable time of day and date. An RTC chip has an integrated quartz oscillator used for incrementing a counter.
HOWTO SET THE RTC POWER ON TIME HOW TO
In this article I describe how to outfit your Raspberry Pi with a Real-Time Clock (RTC) chip.
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All you need to retrofit your Raspberry Pi with a clock is a circuit board you solder yourself, a short C program, and a bit of adjustment to the system. For example, many network services require accurate system time, and some embedded systems require timed remote bootup or intricate synchronization with other devices. Many tasks you might want to assign to the Raspberry Pi require an on-board clock. Whatever the reason, the Rasp Pi has no clock with which to tell time or set an alarm, and this omission has proven inconvenient for many Rasp Pi users. Whether the frugality concerns that played such a central role in designing the Raspberry Pi led to the decision to omit a clock – a built-in feature on most personal computers – is not clear.