Can I share an external EEPROM

Started by Floyd Sense in Piclist9 years ago 1 reply

I have an existing PIC based application and need to add RS232 communications to a PC. Due to timing constraints and other factors, I can't add...

I have an existing PIC based application and need to add RS232 communications to a PC. Due to timing constraints and other factors, I can't add that code to the existing PIC and intend to do the RS232 work with an additional and separate PIC. What I need is a way to occasionally pass information between the two. I've never used an external EEPROM chip and wonder if there's a way to share access...


I2C data line (SDA) goes low and hangs

Started by Basic Poke in Piclist10 years ago 2 replies

I have a PIC18F66J50 with a Microchip EEPROM on the I2C port. Sometimes when I program the MCU using MPLAB, the I2C data line (SDA) goes low...

I have a PIC18F66J50 with a Microchip EEPROM on the I2C port. Sometimes when I program the MCU using MPLAB, the I2C data line (SDA) goes low and stays there. Any read or write I then attempt results in a bus collision error and doesn't work. Here is the sequence of events: * cycle power to the MCU/EEPROM board * compile with MPLAB * program the target device with MPLAB. There is cha...


Programming AT25/45 serial flash data chip

Started by kjh_us in Piclist10 years ago

I'd like to know how one goes about programming a serial flash data chip such as the AT25/45 or SST25 8pin dip? These chips have an SPI...

I'd like to know how one goes about programming a serial flash data chip such as the AT25/45 or SST25 8pin dip? These chips have an SPI interface. But can I simply use an off the shelf EEPROM programmer like the Olimex PG2? I have few programmers in my stock bin Olimex PG2 with 8pin EEProm socket. Warp13 Kanda ISP (with 5x2) socket. If you have recommendations or tips, please...


16F628 Data EEPROM Write Problem

Started by Scott Kellish in Piclist15 years ago 3 replies

  Hi Everyone, I'm having some intermittent problems writing to the data eeprom on 16F628 parts. Below is the code...

  Hi Everyone, I'm having some intermittent problems writing to the data eeprom on 16F628 parts. Below is the code I'm using. Once in a while, probably on


Data EEPROM Write Problem

Started by ramaraju.elec in Piclist15 years ago

DEAR MEMEBERS  please see the follwing c code. i want to wrire some data in EEPROM in perticular address and ...

DEAR MEMEBERS  please see the follwing c code. i want to wrire some data in EEPROM in perticular address and  afterwords i want read from same location.


Selecting a chip need help

Started by ychan_my in Piclist13 years ago 1 reply

i need a otp 20Mhz with ADC chip for my project ,can someone please recommend a pic chip for me thanks ( ofcouse the cheapest the better ...

i need a otp 20Mhz with ADC chip for my project ,can someone please recommend a pic chip for me thanks ( ofcouse the cheapest the better and a flash tpye or eeprom type for testing the code ) thanks in advance.


reading program from EEPROM addenum

Started by Michael Millikan in Piclist15 years ago 2 replies

Hi there, I forgot to mention that I am planning on using a PIC16F877 for the application (with a whopping 8k of program...

Hi there, I forgot to mention that I am planning on using a PIC16F877 for the application (with a whopping 8k of program memory). Vecheslav Silagadze _________________________________________________________________ The new MSN 8: advanced junk mail protec


ICD-2 Problems

Started by Fredrik Krook in Piclist15 years ago 4 replies

Hi! I?m trying to program a circuit... 16F877 and then run it in debugmode... But it doesn?t work... getting the errors listed...

Hi! I?m trying to program a circuit... 16F877 and then run it in debugmode... But it doesn?t work... getting the errors listed below... Does anyone know how to get it to work... Programming Target... ...Erasing Part ...Programming EEPROM Memory


which is the good PIC to start

Started by Mounesh Sutar in Piclist10 years ago 1 reply

Hi All, i need a help i am new to work with microcontrollers, will you tell me, which would be good pic version to start to learn and apply the...

Hi All, i need a help i am new to work with microcontrollers, will you tell me, which would be good pic version to start to learn and apply the same on some small projects. your help would appreciated. thanks, Mounesh On Wed, Jun 4, 2008 at 11:37 PM, Basic Poke wrote: > I have a PIC18F66J50 with a Microchip EEPROM on the I2C port. > Sometimes when I program the M


I2C EEPROM Question

Started by Mr S in Piclist14 years ago 4 replies

This might be an odd question, but here goes. Does anyone have experience using I2C EEPROMs from PIC? Specifically, I'm looking...

This might be an odd question, but here goes. Does anyone have experience using I2C EEPROMs from PIC? Specifically, I'm looking for an answer to a question on the datasheet for the 24LC515 chip. <


Connecting RLT8019AS with PIC16F877 - How to start?

Started by newbietalk in Piclist15 years ago 5 replies

hi, I'm required to connect a RLT8019AS with a PIC16F877 for my project, and I'm very new to this. How do I start? Does...

hi, I'm required to connect a RLT8019AS with a PIC16F877 for my project, and I'm very new to this. How do I start? Does the RLT8019AS needed to be programmed by a programmer? Can I use EEPROM within the PIC16F877 to initialize RLT8019AS? Is it easier to use jum


PIC16F84 Smartcard wafer

Started by tallevi21 in Piclist15 years ago

I am creating a project using a smartcard with the pic16f84 and 26lc16 inside. Would anyone have a small bootloader for the...

I am creating a project using a smartcard with the pic16f84 and 26lc16 inside. Would anyone have a small bootloader for the external 24LC16 eeprom? It needs to be small enough so I can still put my program on the pic. The reason being that when the project is complete, ill need t


Brown out reset with lower voltages

Started by tadaosystems in Piclist13 years ago 1 reply

I'm trying to use a PIC16LF88 at 3.3 volts, but need some kind of brown out reset because values in the eeprom keep getting corrupted ...

I'm trying to use a PIC16LF88 at 3.3 volts, but need some kind of brown out reset because values in the eeprom keep getting corrupted after multiple power cycles. The application circuit has a hard on/off switch, which totally cuts power. I've noticed that the 18F series lets you adjust the voltage level at which a brown out reset would occur, but it's


Having to turn off UART continuous receive

Started by upand_at_them in Piclist14 years ago 5 replies

I have a program in my 16F88 that reads data from a GPS (through the hardware UART), stores it in RAM, parses it, and then writes...

I have a program in my 16F88 that reads data from a GPS (through the hardware UART), stores it in RAM, parses it, and then writes certain items to an external EEPROM. What I've discovered, though, is that I have to turn off continuous receive (CREN=0) before I do my processing ro


EEPROM question

Started by tom_bihn in Piclist15 years ago 2 replies

I've simulated my application successfully with the MPLAB simulator and would like to program the chip soon. In my application, I...

I've simulated my application successfully with the MPLAB simulator and would like to program the chip soon. In my application, I have a matrix keypad for input to check/program a PIN code. When assigning the PIN code, I'm checking the first six digits entered compared with a val


more program space

Started by mr_gees100_peas in Piclist13 years ago 10 replies

Hi, I'm not an expert at his so my question may seem a bit naive. Is there a way to have more program space for you pic micro...

Hi, I'm not an expert at his so my question may seem a bit naive. Is there a way to have more program space for you pic micro besides upgrading to a pic with more space. I mean is it possible to use an external eeprom for additional program space? and if so how?


Purpose of WDT

Started by Bob Blackwell in Piclist15 years ago 3 replies

Hi, I'm new to the group and Microchip PIC's. My current project includes routines to read and write data to EEPROM. Developing the...

Hi, I'm new to the group and Microchip PIC's. My current project includes routines to read and write data to EEPROM. Developing the read routine wasn't that big a challange but getting the write routine to work witout stopping the PIC took a significant amount of time. My problem


PIC12F629,JDM programmer and LINUX ??

Started by sigint112 in Piclist15 years ago 3 replies

Hi everybody, does anyone know,how i can programm a PIC12F629 with the JDM programmer under Linux? I added a PIC12F629 entry in...

Hi everybody, does anyone know,how i can programm a PIC12F629 with the JDM programmer under Linux? I added a PIC12F629 entry in hexfile.cc and could then read a PIC12F629 (only Flash,not EEPROM) but when i try to programm it i get verify errors... is there a tool for Linux to p


K149 programmer

Started by laughty g in Piclist15 years ago 3 replies

Hi, Recently I have just constructed a K149 programmer to program the 93LC46B serial eeprom. I have removed the USB portion. ...

Hi, Recently I have just constructed a K149 programmer to program the 93LC46B serial eeprom. I have removed the USB portion.   I have read on the website that this programmer is capable of programming 16F877 chip too. However, although my programmer board can be detec


Troubleshooting I2C

Started by Max in Piclist7 years ago 4 replies

I have been trying to write to a 24LC1025 EEPROM which uses an I2C interface without success. The software I2C routines that I am using are the...

I have been trying to write to a 24LC1025 EEPROM which uses an I2C interface without success. The software I2C routines that I am using are the same ones that I have successfully used with a Dallas 1307 clock chip and were downloaded from the Dallas website back a few years ago. Using my Pickit2 programmer I wrote some data into the 24LC1025 chip and using these routines I am able to read the data...