Contents
What is RCO in a counter?
RCO is ripple-carry-output. It allows the chip to trigger a second chip to count how many times this one rolls over (from 15 back to 0) – that way, you can cascade multiple chips and make it an 8, 12 or 16 bit counter (or more). Not used if only 0 to 15 is needed.
What is ENT and ENP?
The difference between ENT and ENP is that ENP enables the counter but does not affect RCO. So it enables the counters but does not affect the transition count. You’ll notice (I hope) that for a chain of 162s all the clocks must be tied together.
What is counter IC?
A counter IC is an IC that can count externally input clock pulses. ABLIC’s counter IC can read the counter data via the I2C-bus interface. This capability supports the development of a variety of measuring instruments, infrastructure meters, amusement devices, life counters, etc.
Is used to enable high or disable low the counter?
OUT then goes high and remains high until a new count or a new Mode 0 Control Word is written into the counter. GATE = 1 enables counting, GATE = 0 disables counting….Control Word of 8254 –
| RW1 | RW0 | SELECTION |
|---|---|---|
| 1 | 0 | Read/Write higher byte |
| 1 | 1 | Read/Write lower byte followed by higher byte |
What is the difference between ENT, ENP and output RCO?
RCO of the second counter will go high when the output is 99, so this can be used to enable a third counter, which will then count hundreds. And so on. The difference between ENT and ENP is that ENP enables the counter but does not affect RCO.
What happens when ENP, LD and RCO go high?
If this is true, on a count of 9 the RCO output will go high. Ordinarily, you tie ENP, LD and MR high, then connect the RCO of one counter to the ENT of the next counter in the chain, and so on. So, for the first counter, at a count of 9 RCO will go high and feed ENT of the next.
How are ENP, LD and Mr connected in an integrated circuit?
Ordinarily, you tie ENP, LD and MR high, then connect the RCO of one counter to the ENT of the next counter in the chain, and so on. So, for the first counter, at a count of 9 RCO will go high and feed ENT of the next.