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No, create an account now. Nov 9, 8. Maybe this can solve my timing issue Nov 9, 4. Lol, why i didnt think of that the first time??? Something to duplicate the function of 74HCT equality comparator.

Logic IC’s

When the strobe appears, copy this port to another file register take a “snapshot”. You did not say which PIC you are using? Nov 9, 2. Nov 8, 1. Feb 14, Nov 9, 6. Equality Comparator question Posted by onlylonely in forum: I don’t know why anyone would want to do something so simple in such a time-consuming way.

Posted by new in forum: Nov 9, As for testing the incoming data, why do it bit by bit? 74hcf688 9, 5. Thus we have at least 20 instructions in this 20 uS slice of time. What is unstated in the problem is the data rate, which determines how long we have to process each incoming data chunk.


Oct 14, 1, Quote of the day. If you have the PIC16F or I don’t know which other processors, you have a “parallel slave datashedt available. If available, use 7h4ct688 TBLRD instruction to read the converted value from within a byte long table. Nov 9, 3. Do a subtraction with the character you want to test against, and check if the result is zero. You May Also Like: Apr 24, 7, 1, Aug 21, 11 0.

74HCT Datasheet pdf – 8-bit magnitude comparator – Philips

How to convert c code to hex code for pic? So it seems you’re looking at a stream of 20 character records with at least 74hft688 usecs between the start of one character and the next Do you already have an account?

If so, what duration for the output? If we make no assumptions about when this clock signal occurs during the valid portion meaning the hold time may be zero then we just have the clock time to read the data.

  ISO 7816-4 PDF

How-to on PIC equivalent for equality comparator 74HCT688

Wileyfox delivers an SD card, a big battery, security and a bit more. Yes, subtraction is the way to go. Thanks for the replies guys. Then take as long as you like to decode. Your name or email address: May 11, 5, 1, Use a ‘computed goto’ with dtaasheet 1 for each of the possible 7-bit values. The contents of PortD are latched by an external strobe, which also causes an interrupt, or a flag that you can poll.

In this case data is datasneet to come in on PortD, and PortB. Posted by nurul mia in forum: I wrote the equivalent in C tacked onto the end of a program I’m working on and compiled it.

Nov 10, Be careful crossing code 74hc6t88 boundaries. Jun 6, 3, 5,