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ZYNQ Ultr FPGA Board AXU4EV-E User Manual
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Figure 3-12-1: JTAG Interface Schematic
Part 3.13: Real-time clock
The ZU4EV chip has the function of an RTC real-time clock, with timing
functions such as year, month, day, hour, minute, and second, and week.
External need to connect a 32.768KHz passive clock to provide an accurate
clock source to the internal clock circuit, so that the RTC can accurately provide
clock information. At the same time, in order for the real-time clock to operate
normally after the product is powered off, it is generally necessary to equip the
coin battery (
model LR1130, voltage is 5V
) to supply power to the clock chip.
The BT1 on the development board is a battery Socket. After we put the coin
battery, even the system is off, the coin battery can also power the RTC system
and provide continuous time information.