The counter done bit for the count down instruction C5:0 is addressed as .

The answer is "C5 : 0/ CTD"

Explanation:

The Count Down is an instruction that counts FALSE-to-TRUE rung transitions. Rung Transitions can be brought about by occasions happening in the program, for example, parts going past an identifier or activating a cutoff switch.

The Count Down order is utilized to check down an occasion which happens consistently or remotely and places that esteem in the counter's Collector in augmentations of 1. The distinction between the Count Down is very straightforward, Count Up tallies up, Count Down checks down. The UN (Check Down Sub-current piece) is set when the aggregated worth folds over to +32, 768 (from - 32,767) and keeps tallying down from that point. The Done  bit is set when the amassed esteem is equivalent to or more noteworthy than the preset worth. Furthermore, the Compact disc (Check Down Empower) is set when rung conditions are Valid and reset when rung conditions go Bogus or when the appropriate RES order is empowered. The UN piece can be reset by the RES order or when the aggregated worth goes over +32,767.

The Count Down order utilizes similar fields as the Count Up order. They contain a counter location (C5: x) with "X" being the counter number, a Preset worth field, and a Collector esteem field. Like the clocks and Count Up the Preset and Accumulator bits are addressable and can be changed or refreshed through inner rationale.

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