RTC-62421 module equivalent, 4-bit real time clock module.
Bit name Writable. Recognized as 0 while in read mode. ∗ mark Read only (effective only when HOLD=1) BUSY Enter “0” only when clearing interruption. Enter “1” otherwise. IRQ FLAG Set able only when RESET=1 24H/12H For our company's testing. TEST shou.
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