We happen to be doing an upgrade to an existing card I am selling a customer and they are asking about the feasibility of providing a...

We happen to be doing an upgrade to an existing card I am selling a customer and they are asking about the feasibility of providing a DSS interface (56 kbps AMI encoding). Their thought was to use the audio I/O which has very strong differential drivers with an output impedance of 50 ohms. We can boost the sample rate up to 212 ksps, but with a fixed sample rate. To extract the clock would...

Hi! I am a newbee of using PIC USART and internal clock. I am developing a program that will send a data to an instrument to enable it to...

Hi! I am a newbee of using PIC USART and internal clock. I am developing a program that will send a data to an instrument to enable it to send an output to the PC via RS232. The problem is, my hardware has 8 channels with different instruments which run with different baudrates. The data sent is similar on all channels. How could i send the correct data to the corresponding channel which i...

hi ..... We are using ADIS 16405 IMU from Analog Devices in our application,we are using SPI interface for collecting the data from IMU.We...

hi ..... We are using ADIS 16405 IMU from Analog Devices in our application,we are using SPI interface for collecting the data from IMU.We are able to get the correct data but once in a while data shows 0x0000. Earlier we thought that it might be the problem with power glitches and used regulated 5v dc source but still the same problem is coming.we are operating the device with clock rat...

Hi folks, I am planning to design a PCB featuring three Virtex-4 FX60 FPGAs and some periphery. The three FPGAs are needed due to the data...

Hi folks, I am planning to design a PCB featuring three Virtex-4 FX60 FPGAs and some periphery. The three FPGAs are needed due to the data processing complexity and the amount of high-speed IOs (MGTs). What I am most concerned about right now is to find an appropriate clocking solution. In my opinion, there are mainly three alternatives to design the clocking scheme: a) connection...

Hello, I am trying to use a surface mount crystal for the RTC clock on the STR912F microcontroller. The datasheet states that the...

Hello, I am trying to use a surface mount crystal for the RTC clock on the STR912F microcontroller. The datasheet states that the load capacitance is 8pF (Typ). Unfortunately, I am unable to find an SMD crystal with that load capacitance. I can, however, find 7pF and 9pF. Can they be used? Any hints or ideas? Thank you, A

i am working on a project on wireless sensors....i need a processor where the clock frequency can be varied during RUN-TIME so as use in...

i am working on a project on wireless sensors....i need a processor where the clock frequency can be varied during RUN-TIME so as use in low-power applications....but it must not be as low as is the case in the sleep mode. i found that the option of variable frequency is not available in avr controllers on which i have worked on till now...i was thinking about msp430 series but i cannot find a ...

Hello, When I toggle a GPIO on my MSP430 processor I have (or at least I think I have :) a clean understanding of what happens. I can...

Hello, When I toggle a GPIO on my MSP430 processor I have (or at least I think I have :) a clean understanding of what happens. I can relate the frequency of the toggling to the instructions used and the clock speed of the CPU. Nothing strange happens. The MSP430 runs the instructions below: /* Put 0xAA in the r15 register. */ mov.b #-86, r15 /* Write the contents of r15 on p...

I apologize in advance if I didn't cross-post properly. I want to write a .c and .h file controlling a DS1302 real-time clock using a PIC18F2620...

I apologize in advance if I didn't cross-post properly. I want to write a .c and .h file controlling a DS1302 real-time clock using a PIC18F2620 microcontroller. I want to keep my RTC code's pin usage flexible, so I want to write an initialization routine that reads in the pins that the whole program wants to use in main.c and have RTC.c and RTC.h refer to the wanted pins. I am having trouble...

I'm trying to use the Synchronous Serial Controller (SSC) on the Atme AT91SAM7S64 development kit (AT91SAM7S-EK) to interface with a...

I'm trying to use the Synchronous Serial Controller (SSC) on the Atme AT91SAM7S64 development kit (AT91SAM7S-EK) to interface with a Nordi nRF2401 radio transceiver. The Atmel documentatio (6175A-ATARM-13-Jul-05, page 352) indicates that the SSC's transmit cloc can "drive the TK I/O pad continuously or be limited to the actual dat transfer." However, the options for controlling the output o...

I have a Olimex devboard AVR-P28B with a ATMEGA8 on it. I programmed and used it just fine when it was running on the internal RC oscillator. But...

I have a Olimex devboard AVR-P28B with a ATMEGA8 on it. I programmed and used it just fine when it was running on the internal RC oscillator. But I wanted to try to get it working on the 4Mhz crystal so I set the fuse bits and wrote those. Problem is, now it doesn't work anymore and I can't get it to respond and change the fuse bits. How can I program the fuse bits in this situation? I assu...

Greetings: A recent thread in this N.G. addressed the issue of dead batteries in CMOS Clock/Calendar/RAM devices such as the Dallas DS1287,...

Greetings: A recent thread in this N.G. addressed the issue of dead batteries in CMOS Clock/Calendar/RAM devices such as the Dallas DS1287, DS12887, Twinhead TH6887A, and others; some of these devices are no longer available as new stock and old stock is often also unusable and for many there are no equivalent replacements. Surgery to permit attaching external backup power sources is poss...

Read All About it, Read all About it. Atmel releases single clock cycle 8051...

Read All About it, Read all About it. Atmel releases single clock cycle 8051 chips... http://www.atmel.com/dyn/corporate/view_detail.asp?FileName=AT89LP_3_8.html -- Best Regards, Ulf Samuelsson ulf@a-t-m-e-l.com This message is intended to be my own personal view and it may or may not be shared by my employer Atmel Nordic AB

I read this in Wikipedia near the end of the RMII docs: http://en.wikipedia.org/wiki/RMII "Since the RMII standard neglected to stipulate that...

I read this in Wikipedia near the end of the RMII docs: http://en.wikipedia.org/wiki/RMII "Since the RMII standard neglected to stipulate that TX_EN should only be sampled on alternate clock cycles, it is not symmetric with CRS_DV and two RMII PHY devices cannot be connected back to back to form a repeater; this is possible, however, with the National DP83848 which supplies the decoded ...

Hi all, I'm trying to sample the AVR's ADC on 3 channels at 8kHz, 8kHz and 16kHz respectively. I've set up a 32kHz interrupt on an 8MHz...

Hi all, I'm trying to sample the AVR's ADC on 3 channels at 8kHz, 8kHz and 16kHz respectively. I've set up a 32kHz interrupt on an 8MHz clock using timer0 (prescale=1, count to 250), and within the timer interrupt handler, I have a state machine which samples ch-1, ch-2, ch-3, ch-2. The code is at http://www.0x0000ff.com/src/main.c if you're interested... To test it, I put a variable re...

Just getting to know embedded programming with the atmega8. I've had some experience using the PIC chip with MicroCode Studio and...

Just getting to know embedded programming with the atmega8. I've had some experience using the PIC chip with MicroCode Studio and have switched to using the avr-gcc tool chain with the atmega8 chip. I've been spending a good few weeks getting up to speed on transferring my knowledge of the PIC to the avr, looking over the docs and all. I'm using a atmega8 development board from sparkfun w...

Hi! I have a big FIFO chip covered by dust, that I'd like to finally use. The most useful application I'm imagining for it is to finally...

Hi! I have a big FIFO chip covered by dust, that I'd like to finally use. The most useful application I'm imagining for it is to finally make myself a logic analyzer. This FIFO (Texas Instruments SN74V3690-6PEU) is a 3.3V device, but has 5V tolerant inputs. "Great!" I thought. What I'm asking you is: should I connect the probes (just a header cable) directly to the FIFO, or should I use ...

Dear all, I am working on a hardware which has AT91SAM7S64, which works on 18.432 MHz main clock. This is the maximum frequency which can be...

Dear all, I am working on a hardware which has AT91SAM7S64, which works on 18.432 MHz main clock. This is the maximum frequency which can be seen on hardware. Now we are planning to buy an analog oscilloscope, we have seen several 30 MHz , 60 MHz and 100 MHz oscilloscopes. The 100 MHZ scope has the least rise time - 3.6 nS, for 60 MHz it is 5-6 nS, 30 MHz has around 11 nS. Can you suggest w...

Hi, How is it possible to achieve fast serial baud rate of 115200,230400,460800,921600? I was trying to communicate with the PC at these...

Hi, How is it possible to achieve fast serial baud rate of 115200,230400,460800,921600? I was trying to communicate with the PC at these rates. Using a 20MHz clock frequency is not possible due to deviation errors? What actually affects the desired baud rate, and how do I achieve this common PC standards?? Thks Heng

Hi all, Supposing AVR is a configured as a Master SPI device. Is it possible to discard AVR master SCK output signal and make SCK as an input...

Hi all, Supposing AVR is a configured as a Master SPI device. Is it possible to discard AVR master SCK output signal and make SCK as an input in order to apply external bitstream clock. My app is connecting a Quad voice A/MU law Codec (MSM7705) to an AVR SPI bus. Many thanks

Hi, I have a question in the i2c protocol. When the slave or the master sends a data byte the line state will hold the last bit state? For...

Hi, I have a question in the i2c protocol. When the slave or the master sends a data byte the line state will hold the last bit state? For example I send a byte containing "0x01" it means the last bit is "1". The sda line will hold this value ( "1" ) or will be pulled down in the beginning in the next clock cycle? Thanks Attila