The ht is a serial timekeeper ic which provides seconds, minutes, hours, day, date, month and year information. Ht81 datasheet pdf 8 page holtek semiconductor inc. In using the ht80 ht81, set first the wp and ch to 0 and wait for about 3 seconds, the oscilla tor will generate the clocks for internal use. Buy your ht818soplf from an authorized holtek distributor. Data can be writteninto the designated register only if the writeprotect signal wp is set to logic 0. Holtek ic pdf,electronic components datasheet search,ic pdf. Holtek, alldatasheet, datasheet, datasheet search site for electronic components and. Ht80 datasheet, pinout,application circuits ht80ht81. U you can also download the datasheet for ht8, ht80, ht808dep.
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Holtek serial timekeeper chip,alldatasheet, datasheet, datasheet search site for electronic. The writeprotect register should be set first before restarting the system or before writing the new datasheet search, datasheets, datasheet search site for. The ht80 ht81 is a serial timekeeper ic which provides seconds. Ht80ht816october 2, 1999write protect registerthis register is used to prevent a write operation to any other register.