Latest threads in Microcontroller Discussionsshow only best voted threads
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Pull up vs pulldown
For logic inputs, we can either use pull up resistors to 5V for pull down to ground. What are the pros and cons for boths and which is better to use and why? Thanks
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17 years ago
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low cost microcontroller with RS32
Hi I'm trying to build a simple system with a microcontroller and 2 RS232 ports to receive data on 1 port and send out new data on the 2nd port requirements are 1. 2x RS232 UART port, configurable...
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17 years ago
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LCD
I want to program the text to a 2 line 5 x 7 LCD module. But before I do that in a language I am experimental with just the LCD module with a push button for the clock or enable signal and some DIP...
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17 years ago
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DS89C450 serial data transfer
I am having serial port communications problems. Below is the simple code in the DS89C450 MCU that I am trying to get to work properly. It is a simple routine to receive data via the serial port at...
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17 years ago
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PIC assembly code EEPROM
Hi, In PIC's such as the 16F84A, there is 64 bytes of EEPROM memory for data. How can you set some of these memory with values in assembly code? I don't want to be using the EEPROM's control registers...
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17 years ago
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Serial to ethernet
I am using the DS89C450 mcu and would like to find the easiest/quickest solution to use TCP/IP. I was thinking of just using a ttl serial to ethernet converter?? Any suggestions? Thanks in advance.
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17 years ago
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Looking for very fast MCU, any advice?
Hello, I am using a PIC18F4620 as an universal "workhorse" in many applications and I like this MCU because of its versatility and it's easy to use. Recently I am experimenting with an USB-interface...
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17 years ago
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how to allocate large arrays in CCS
I have not been able to find information in the documentation for this question... How can I allocate an array of 512 bytes (for instance) using the CCS C compiler on a PIC18LF2525 component? Is it...
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17 years ago
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Interfacing the DS12887 with PIC
Hello, I'm trying to interface the real-time clock DS12887 with PIC18F452 but since I'm new in these things I'm not getting any results.. Does anyone have experience with this? Or with any other...
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17 years ago
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external memory problem
I am using a 89C450MCL mcu running at 29.492mhz With just the micro, 74F573 (or 74HCT573 tried both) and a IS62C1024-35 RAM chip it seems I loose the address sometimes at the output of the latch when...
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17 years ago
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External ROM read problem
I have a circuit using a DS89C450 micro and an external 1m(128kx8)ROM. I am using P1.0 as an upper address bit which is low for this test. I have /CE tied low and use /OE derived from p3.7(/rd) to...
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17 years ago
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PICtutor Send Program, Help!
Can anyone help?. My father purchased a PICtutor deluxe board many years ago. He has now decided at the age of 77 to have a go at microcontroller programming. We are using the PICtutor Send.exe...
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17 years ago
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Where to download free PIC assembler / basic compiler?
I mean those fully function ones, not with limited function or with expiry date. Thanks.
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17 years ago
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keypad and 7segment LEDs
I recently bought a 8051/8052 evaluation board with AT89S52, hex keypad, 6 digit 7seg LEDs and a beep. It's easy to find information on the programming of the microcontroller, but I can't find any...
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17 years ago
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Serial transfer problem
I am using a DS89C440 flash micro running at 29.491Mhz with 64k of external RAM and no external ROM. I am running my serial port using timer-1 for baud rate generator at 19200baud. My source computer...
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17 years ago
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