quadrature encoder

Started by princekcs in comp.arch.embedded9 years ago 16 replies

why is it necessary to clock on rising and falling edge when reading a quadrature encoder? ...

why is it necessary to clock on rising and falling edge when reading a quadrature encoder? --------------------------------------- Posted through http://www.EmbeddedRelated.com


87c520

Started by Angela & Gary in comp.arch.embedded14 years ago 1 reply

Simple question re: the serial port. I would like to clock the micro @ 25MHz. What serial port speeds would this support? Thanks in...

Simple question re: the serial port. I would like to clock the micro @ 25MHz. What serial port speeds would this support? Thanks in advance. Gary


TMDS to LVDS

Started by volucris in comp.arch.embedded10 years ago 3 replies

Hi folks, I need to convert TMDS to LVDS. Im sure someone has done this before, so rather than reinvent the wheel, I'd like to ask what chips...

Hi folks, I need to convert TMDS to LVDS. Im sure someone has done this before, so rather than reinvent the wheel, I'd like to ask what chips are suitable for this. I need to drive a panel with 3 data and one clock pair (so I assume 18 bit?) Thanks, -Ian


how to write a simulator for a processor

Started by Master in comp.arch.embedded15 years ago 4 replies

i want programming details abt writing a processor Simulator in c language.. simulating a interrupt,clock ,bus register etc.. please mail...

i want programming details abt writing a processor Simulator in c language.. simulating a interrupt,clock ,bus register etc.. please mail me at bsvijayan@yahoo.com thank u buddy..


ST semi RTC M41T94

Started by Martin Griffith in comp.arch.embedded11 years ago 12 replies

I'm waiting for a couple of M41T94 real time clock chips to arrive, so I'm scribbling some 8052 C code in advance. It's an SPI ic. Any gotchas...

I'm waiting for a couple of M41T94 real time clock chips to arrive, so I'm scribbling some 8052 C code in advance. It's an SPI ic. Any gotchas on this RTC? Thanks martin


Compiling code

Started by Mike Burch in comp.arch.embedded11 years ago 15 replies

Hello fella's I know I am completely out of my league with this question but I have to ask anyway. Be gentle. :-) I have built this clock...

Hello fella's I know I am completely out of my league with this question but I have to ask anyway. Be gentle. :-) I have built this clock because it is really cool! and it is completed up to the point of programming it. It uses 3 pic18f252 micro controllers. 1 controller is a master and 2 respond as slaves. I don't know how to do this. I think it would be like flash programming a bio...


Start-up Xilkernel on Microblaze

Started by Yannick in comp.arch.embedded12 years ago 1 reply

Hi, How many long Xilkernel take to startup with microblaze (System Clock : 50 MHz). On my design, the Microblaze need more than 30 second to...

Hi, How many long Xilkernel take to startup with microblaze (System Clock : 50 MHz). On my design, the Microblaze need more than 30 second to create the first thread after xil_kernel_main(). Regards, Yannick


SPI: speed calculation

Started by Roman Mashak in comp.arch.embedded15 years ago 5 replies

Hello, All! I'd like to get speed of 500 Kbit/sec by SPI communication. I don't quite understand how can I calculate the clock frequency to...

Hello, All! I'd like to get speed of 500 Kbit/sec by SPI communication. I don't quite understand how can I calculate the clock frequency to adjust to this value? Could you please explain. I'm using ATmega162. Thank you. With best regards, Roman Mashak. E-mail: mrv@tusur.ru


AT89C51

Started by kuk in comp.arch.embedded14 years ago 2 replies

CAN THE EXTERNAL CIRCUIT INCREASE THE INTERNAL CLOCK SPEED OF TH MICROCONTROLLER(AT89C51) EXTERNAL CIRCUITS MEANS...

CAN THE EXTERNAL CIRCUIT INCREASE THE INTERNAL CLOCK SPEED OF TH MICROCONTROLLER(AT89C51) EXTERNAL CIRCUITS MEANS OSCILLATOR/RESONATOR This message was sent using the comp.arch.embedded web interface o www.EmbeddedRelated.com


nios II sratixII interrupt handling with uController

Started by Anonymous in comp.arch.embedded14 years ago 4 replies

hi all! I'm using NiosII with StratixII. i wanted to get interrupts from a micro controller of 7.393MHz Oscillator which generates half...

hi all! I'm using NiosII with StratixII. i wanted to get interrupts from a micro controller of 7.393MHz Oscillator which generates half the oscillator clock. Nios works at 50Mhz. so what modification i need to do on nios


General Advice

Started by dbernat32 in comp.arch.embedded15 years ago 11 replies

I need some input on what the best microcontroller (relatively cheap) and OS to use for a project I will be starting soon. The project...

I need some input on what the best microcontroller (relatively cheap) and OS to use for a project I will be starting soon. The project requires a Ethernet connection, so an on-board MAC is desirable. A real time clock and several timers will be required. The MCU will need to interface with a RC5 encoder for IR control of devices (and possible RF communication as well). On the software si...


PIC migration timing problem

Started by PigPOg in comp.arch.embedded13 years ago 11 replies

Hi, can anyone advise please? I've migrated code running on a PIC16C54 to a PIC18F1320. Both use an external RC network. On the OSC2 pin both...

Hi, can anyone advise please? I've migrated code running on a PIC16C54 to a PIC18F1320. Both use an external RC network. On the OSC2 pin both processors show a nice clock at 25 KHz (which is correct). However, the 18F1320 seems to be executing code at twice the speed! Have I overlooked something? Thanks in advance for any help? Simon


I2C232 from Emicros

Started by bb in comp.arch.embedded14 years ago 1 reply

Hi all, Does anybody have any experience working with the Emicros I2C232 converter? I expected it to have a clock signal, but I am not...

Hi all, Does anybody have any experience working with the Emicros I2C232 converter? I expected it to have a clock signal, but I am not getting a signal out at all. Is there some sort of command that needs to be sent to initialize it? Thanks, Ben


Sync PCI RS-422

Started by Larry Martell in comp.arch.embedded14 years ago 1 reply

Does anyone know of a PCI card with a RS-422 port that supports an external clock and a frame sync signal? Thanks! -larry

Does anyone know of a PCI card with a RS-422 port that supports an external clock and a frame sync signal? Thanks! -larry


DS 1307 Real time Clock interface with Intel 386EX processor

Started by learner in comp.arch.embedded15 years ago 5 replies

Is it possible to hook pins SCL,SDA of Dallas DS1307 RTC with I/O ports of Intel 386EX processor? Thanks learner

Is it possible to hook pins SCL,SDA of Dallas DS1307 RTC with I/O ports of Intel 386EX processor? Thanks learner


stm32f103: flash latency and baud rate calculation

Started by kristoff Bonne in comp.arch.embedded4 years ago 4 replies

Hi all, I am still relative new to low-level programming microcontrollers, currently doing some work on a STM32F103RB using forth. To...

Hi all, I am still relative new to low-level programming microcontrollers, currently doing some work on a STM32F103RB using forth. To get to know the device, I am now trying out some code to change the clock from internal8Mhz, to External48Mhz and External72Mhz. There are two things I do not really understand. 1/ What exactly is the purpose of the Flash Latency? You need to chang...


SPI RTC

Started by Dick Ginther in comp.arch.embedded15 years ago 8 replies

Hi, Does anyone know of a small smt real-time clock (RTC) that has a SPI interface? Ideally, the device could still operate with a very low...

Hi, Does anyone know of a small smt real-time clock (RTC) that has a SPI interface? Ideally, the device could still operate with a very low battery voltage and would have a very low standby current spec. Anybody have a favourite part or know of one? Thanks.


help! need LPC9xx ICP spec

Started by Peter Jakacki in comp.arch.embedded15 years ago 2 replies

I just received some samples of the LPC903 the other day and it hit me. Where is the specification for the ICP? I know it only needs...

I just received some samples of the LPC903 the other day and it hit me. Where is the specification for the ICP? I know it only needs clock,data,reset but I can't any find a document that describes the timing and format for that section. I know that you can use the eval board plus an adaptor to talk to these things but it is usual for a manufacturer to release the programming details. ...


What's wrong?

Started by Anonymous in comp.arch.embedded16 years ago 5 replies

Hi all, I'm really losing my mind now, been fighting with this for 8 days now, I give up. I hope you can tell me what's wrong in my setup....

Hi all, I'm really losing my mind now, been fighting with this for 8 days now, I give up. I hope you can tell me what's wrong in my setup. :( I self made a PIC18F8720 development board, and it seems to work, because I can program the chip with no problems. I'm using 100 nF SMD capacitors near every Vdd (including AVdd), and an integrated clock oscillator. It's a 24 MHz CMOS part by Epso...


Inexpensive

Started by larwe in comp.arch.embedded10 years ago 3 replies

I'm building a little toy, and need to read a hand-encoded storage medium something like punched tape. Right now I'm looking at the Panasonic...

I'm building a little toy, and need to read a hand-encoded storage medium something like punched tape. Right now I'm looking at the Panasonic CNB1002 reflective photosensors, which integrate an IR LED and phototransistor in a small gull-wing SMD package. In my small quantities they're about $0.55 each. I need three - a clock bit, and two data channels. Apart from the cost they're perfect - th...