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PIC16F877-20/PQ

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File Size : 116 KB Manufacturer: Description:The LS469 is an 8-bit synchronous up down counter with parallel load and hold capability Three function-select in- puts (LD UD CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK) The LOAD operation loads the inputs (D7 CD0) into the out- put register (Q7 CQ0) The HOLD operation holds the previ- ous value regardless of clock transitions The INCREMENT operation adds one to the output register when the carry-in input is TRUE (CBI e LOW) otherwise the operation is a HOLD The carry-out (CBO) is TRUE (CBO e LOW) when the output register (Q7 CQ0) is all HIGHs otherwise FALSE (CBO e HIGH) The DECREMENT operation subtracts one from the output register when the borrow-in input is TRUE (CBI e LOW) otherwise the operation is a HOLD The bor- row-out (CBO) is TRUE (CBO e LOW) when the output reg- ister (Q7 CQ0) is all LOWs otherwise FALSE (CBO e HIGH)