Hi, I'm doing a project in clockless uart..as u know that the primary function of uart is parallel to serial conversion while transmitting and...

Hi, I'm doing a project in clockless uart..as u know that the primary function of uart is parallel to serial conversion while transmitting and serial to paralel conversion while receiving..I was wondering if someone could tell me as how can i do a parallel to serial conversion and vice versa without using a clock. Note: This is a circuit whoch doesnt use a clock at all/ Asynchronous Circu...

We are using a Renesas H8S 2674R processor and cannot get the specified current consumption numbers when entering the All Module Clock Stop...

We are using a Renesas H8S 2674R processor and cannot get the specified current consumption numbers when entering the All Module Clock Stop mode. Has anyone successfully used this mode in this family of H8S processors?

I'm wondering if there is some well known issue with the 16F872 WRT using the RC oscillator mode. I was told that the 'F872 was a...

I'm wondering if there is some well known issue with the 16F872 WRT using the RC oscillator mode. I was told that the 'F872 was a pin-compatible replacement for the 'C62B (ignoring the A/D). When the 'C62B is in the socket I get a nice clock out signal on pin 10, CLKOUT. Quickly swapping in the 'F872 I get a DC low-level and pin 9, CLKIN is a DC high-level. Anyone? Thanks. -- - Mark ...

Hi all, I have two problem when reading the paper from [url]http://www.siliconlogic.com/pdf/Arbiters_MattWeber_SLE.pdf [/url] [1] Is...

Hi all, I have two problem when reading the paper from [url]http://www.siliconlogic.com/pdf/Arbiters_MattWeber_SLE.pdf [/url] [1] Is Arbiter pure comb logic? If yes, shall its comb logic delay be constrained to within one clock cycle? [2] Shall one request and one grant both hold only one clock cycle? Best regards, Davy

Hello, after programming the clock of the chip C8051F412 to 49MHz I get the error message "Target fail to response"! So I'm not longer able to...

Hello, after programming the clock of the chip C8051F412 to 49MHz I get the error message "Target fail to response"! So I'm not longer able to programm the chip. The programmer works well (I have it tested on a other target). The hardware was not changed, so it's only a software issue. **?? How can I now erase the flash ??** Flash tools does also not help. The code of dead looks so: ...

can anyone explain me to calculate the wait states needed? Suppose we are using 120 nanosecond ROMs, which have valid data on the bus 120 ns...

can anyone explain me to calculate the wait states needed? Suppose we are using 120 nanosecond ROMs, which have valid data on the bus 120 ns after the falling edge on the Output Enable line with a clock rate of 25 MHz (which means a clock cycle of 40 nanoseconds). How many wait states must the microprocessor insert into each bus cycle that reads from the ROM? -----------------...

HI, I am implementing an ALP program to implement a real time clock to display hour,minute,second using features available in a timer unit....

HI, I am implementing an ALP program to implement a real time clock to display hour,minute,second using features available in a timer unit. Digits have to displayed on one of the GPIO ports of HC12 micro-controller. I do know how to proceed on this in C language but am a newbie in micro-controllers and assembly programming - was hoping that someone could point me in the right direction -- p...

Hi all, just looked through the ATTiny 861 datasheet with the "new" options to use a High-Frequency PLL clock with the 8 MHz calibrated...

Hi all, just looked through the ATTiny 861 datasheet with the "new" options to use a High-Frequency PLL clock with the 8 MHz calibrated oscillator to clock the processor and the periphials. So by using this combination, the processor can run at 16 MHz with the internal RC oscillator. However, the datasheet also says that the maximum "speed" at 3.3V is 10 MHz. It doesn't say what this "10...

Please can i have your help? I'm confused about the following situation: A transceiver is connected in SPI mode to a...

Please can i have your help? I'm confused about the following situation: A transceiver is connected in SPI mode to a microcontroller(LPC12xx). The transceiver outputs a continous clock ,and it does not drive any SSEL line to enable the SPI section of the microcontroller. The microcontroller should decide when to start a data transmission,but just enabling its SPI module it goes in Busy...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to switch from the 1Mhz internal clock to the 8Mhz internal. But I can't get the external crystal to function? What is the procedure? I have already messed up four M32's and still can't get one to work at 16Mhz. I am using 22pf caps on the crystal...

I'm working with the ms430-449STK2 olimex development kit that IAR distributes with its software, "XT2 = 8Mhz" The problem is that I can't...

I'm working with the ms430-449STK2 olimex development kit that IAR distributes with its software, "XT2 = 8Mhz" The problem is that I can't select the XT2 as a clock source for the MCLK. In fact I make this instruction: FLL_CTL1 = (SELS + SELM1) & (~XT2OFF); and the IAR IDE show me that the right bits are sets, as follows: SELM1 = 1 SELM0 = 0 XT20FF= 0 SELS = 1 However the MCLK w...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to switch from the 1Mhz internal clock to the 8Mhz internal. But I can't get the external crystal to function? What is the procedure? I have already messed up four M32's and still can't get one to work at 16Mhz. I am using 22pf caps on the crystal...

Has anyone here used the SPI port on the AT91SAM7SXXX parts? If so, have you observed the same problem I have? It appears to me that the...

Has anyone here used the SPI port on the AT91SAM7SXXX parts? If so, have you observed the same problem I have? It appears to me that the edge used to capture data is reversed from what the data sheet shows. I am using CPOL=0, NCPHA=1. According to the data sheet, this should cause the SPI clock to idle low, and to capture MISO data on rising clock edges, including the first rising ed...

Hi, I'm trying to pull out data from the ADS8320 (a 16-bit ADC by Analog Devices. See bottom of page 10...

Hi, I'm trying to pull out data from the ADS8320 (a 16-bit ADC by Analog Devices. See bottom of page 10 in http://focus.ti.com/lit/ds/symlink/ads8320.pdf ) using the SPI in an AT91SAM7S256. The problem is that the ADC needs 6 extra clock cycles to sample the analog signal, before the 16 cycles that will output each of the conversion result bits. So, a complete ADC cycle involves a minimum...

Hello. I am developing with samsung 2410 and currently activating LCD. Now LCD works somehow but not perpectly. The problem is that I have...

Hello. I am developing with samsung 2410 and currently activating LCD. Now LCD works somehow but not perpectly. The problem is that I have coded LCD to toggle between red and white and lower 1/3 of LCD displays opposite color. When upper 2/3 displays red, lower 1/3 displays white. vice versa. Typical dot clock of LCD module is 24.5Mhz, but I am driving LCD with 12M dot clock for unavoidable...

Hi, I see in the datasheet of the AT91SAM7A3 that the real-time timer (RTT) is fed by the Slow Clock, which is an internal RC...

Hi, I see in the datasheet of the AT91SAM7A3 that the real-time timer (RTT) is fed by the Slow Clock, which is an internal RC oscillator (f=22 kHz to 42 kHz). The RTT has a 16-bit prescaler and a 32-bit counter. How are we supposed to use such an inaccurate clock as the source for a real-time timer? The only way I can think of is to add a crystal (which will not always be running (other...

what is the error in the following code. in it the main module is "test". in that module's "always" block another module "counter" is called....

what is the error in the following code. in it the main module is "test". in that module's "always" block another module "counter" is called. but it shows error. how can i solve the problem? how can i call another module in always block? module counter(clock, reset, count); input clock, reset; output [3:0] count; reg [3:0] next_count,count; always@* begin ...

Hi, I want to know if it is possible to use at the same time the USB and UART peripheral on the AT91SAM7S256-128-64-321, with zero error on...

Hi, I want to know if it is possible to use at the same time the USB and UART peripheral on the AT91SAM7S256-128-64-321, with zero error on the UART part. The clocking scheme is what concerns me. As far as I understand you have the main clock MCK from an external crystal (or clock signal). Is MCK derived directly, I mean, does MCK have the same frequency as the external crystal? The UAR...

Simple noobie question about the Atmel AVR STK500... Can the XT1 and XT2 pins on PORTE\AUX used to supply a clock signal to an external...

Simple noobie question about the Atmel AVR STK500... Can the XT1 and XT2 pins on PORTE\AUX used to supply a clock signal to an external device (explanation below)? As I am learning to program and interface the AVR's I have a 16550 UART on a separate experiment board and I see that the 16550 needs a crystal or clock source on pins 16 and 17 (XIN and XOUT)... can the XT1 and XT2 pins be ...

I need to write a program that implements a real-time clock in code composer studio. The LCD display shows hours , minutes and seconds ....

I need to write a program that implements a real-time clock in code composer studio. The LCD display shows hours , minutes and seconds . By pressing a button you can enter / exit in setting mode which is characterized by on / off LED. Pressing one of the other three keys in setting mode you can set hours , minutes and seconds . Can someone help me? --------------------------------------- Poste...