74HCT688 DATASHEET PDF

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If so, what duration for the output? If available, use the TBLRD instruction to read the converted value from within a byte long table.

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Use a ‘computed goto’ with destinations 1 for each of the possible 7-bit values. Nov 9, 8. I attached the datasheet of 74HCT If you have the PIC16F or I don’t know which other processors, you have a “parallel slave port” available. You May Also Like: Nov 10, Aug 21, 11 0. Daasheet 14, 1, Discussion in ‘ Embedded Systems and Microcontrollers ‘ started by beowulfNov 8, Something to duplicate the function of 74HCT equality comparator.

As for testing the incoming data, why do it bit by bit? Thus we have at least 20 instructions in this 20 uS slice of time. Lol, why i didnt think datssheet that the first time??? Nov 9, Nov 9, 9. The contents of PortD are latched by an external strobe, which also causes an interrupt, or a 774hct688 that you can poll.

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Do you already have an account? Your name or email address: Feb 12, Nov 9, 2. Now for my question, is there a faster way to implement this routine? Posted by new in forum: Do a subtraction with the character you want to test against, and check if the 74jct688 is zero. 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.

74HCT688 Datasheet

Wileyfox delivers an SD card, a big battery, security and a bit more. No, create an account now. Apr 24, 7, 1, Then take as long as you like to decode. Posted by nurul mia in forum: How to convert c code to hex code for pic?

An Introduction to Programmable Logic Learn about a hardware-based approach to performing calculations, routing digital signals, and controlling embedded systems using programmable logic and FPGAs. You did not say which PIC you are using?

How-to on PIC equivalent for equality comparator 74HCT | All About Circuits

So it seems you’re looking at a stream of 20 character records with at least 50 usecs between the start of one character and the next Jun 6, 3, 5, Thanks for the replies guys. Quote of the day. I don’t know why anyone would want to do something so simple in such a time-consuming way. Equality Datahseet question Posted by onlylonely in forum: Embedded Systems and Microcontrollers.

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The default is 4MHz. A separate active low output for each character? Yes, subtraction is the way to go. Yes, my password is: What the Wileyfox Smartphone Gets Right A new player as a rogue smartphone has emerged in datashest competitive market: Maybe this can solve my timing issue Nov 9, 5.

In this case data is assumed to come in on PortD, and PortB. I wrote the equivalent in C tacked onto the end of a program I’m working on and compiled it. Nov 9, 3. Nov 9, 4. Electrical Engineers and Chocolatiers Have Created Something Delicious Engineers are applying a technique used in crude oil processing to create low-fat chocolate that actually tastes delicious.

Where and how to simulate an equivalent circuit for Posted by selvac19 in forum: When the strobe appears, copy this port to another file register take a “snapshot”. Be careful crossing code page boundaries.