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Atmel ATTiny 861 Frequency @ 3.3V

Started by Holger Metschulat in comp.arch.embedded11 years ago 1 reply

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...


can u Help me?

Started by kalakkumkarthikeyan in comp.arch.embedded16 years ago 1 reply

Hi Dear all.. Actually i have a doubt to configure a relaxation oscillator using simple inverter. Have u any idea.. ? Your's kalakkum ...

Hi Dear all.. Actually i have a doubt to configure a relaxation oscillator using simple inverter. Have u any idea.. ? Your's kalakkum karthikeyan.A


AT89C51

Started by kuk in comp.arch.embedded19 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


Cheapest 8-bit micro in SOIC case

Started by Dejan in comp.arch.embedded19 years ago 17 replies

It should have internal oscillator, 8-bit timer and external interrupt possibility and at least 1kb of code memory. 32 bytes of RAM are...

It should have internal oscillator, 8-bit timer and external interrupt possibility and at least 1kb of code memory. 32 bytes of RAM are enough. ROM parts are not an option (FLASH, OTP, EEROM are OK). Quantity is 50k+ Any ideas? - Dejan


Driving LED with PWM, Beginner's Question

Started by syr123 in comp.arch.embedded15 years ago 2 replies

Hi all! True beginner here, but was very excited to find this site. I would greatly appreciate if someone could shed some light on whether or...

Hi all! True beginner here, but was very excited to find this site. I would greatly appreciate if someone could shed some light on whether or not I am going about a project correctly. Here are the facts: Using - PIC16F690 with an external 20Mhz crystal oscillator, powered by 5V (at 300mA? at least that's what the wall wart says - seems to be about 1 amp when I measure it). I am tryi...


What's wrong?

Started by Anonymous in comp.arch.embedded20 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...


50+ MIPS flash MCU needed

Started by Antti in comp.arch.embedded17 years ago 17 replies

hi anybody knows options for 50+MIPS 8/16 bit flash MCU? besides PIC/SX/SiLabs? there must some around.. should FAST and cheap. not much...

hi anybody knows options for 50+MIPS 8/16 bit flash MCU? besides PIC/SX/SiLabs? there must some around.. should FAST and cheap. not much flash required. internal oscillator is a must. Antti


DELAY and the 8051

Started by Lodewicus Maas in comp.arch.embedded14 years ago 7 replies

Hi All I've obtained the "The 8051 Micro Controller and Embedded Systems Using Assembly and C-2nd-Ed -", and in this manual the DELAY routine...

Hi All I've obtained the "The 8051 Micro Controller and Embedded Systems Using Assembly and C-2nd-Ed -", and in this manual the DELAY routine is described as below, which really confuses me a lot ###################################### In original 8051, one machine cycle lasts 12 oscillator periods So, 1 oscilator period for a 12Mhz Crystal will be 12.0 Mhz / 12 = 1Mhz Therefore on...


PIC18F1320 and wake-up

Started by simon in comp.arch.embedded19 years ago 2 replies

Hello, can anyone help please? I have code that executes on wake-up from a port interrupt with the CPU clocked from the Internal oscillator...

Hello, can anyone help please? I have code that executes on wake-up from a port interrupt with the CPU clocked from the Internal oscillator block at 4 MHz. This works fine. I've now got to add a function whereby every 15 minutes, the CPU wakes to send a signal to a remote unit to say 'I'm still working' and then revert to sleep. Low power consumption is a priority with this project. ...


Testing OSCCAL without programming a PIC

Started by Robert Scott in comp.arch.embedded19 years ago 5 replies

Does anyone know how they figure out the correct value for OSCCAL in the OTP PICs at the factory? Since they are OTP, they can't program any...

Does anyone know how they figure out the correct value for OSCCAL in the OTP PICs at the factory? Since they are OTP, they can't program any configuration bits to put the device into the internal RC oscillator mode. Is there some secret factory mode that they use? -Robert Scott Ypsilanti, Michigan


Newbie puzzled by HC908 programming

Started by bhet...@gmail.com in comp.arch.embedded17 years ago 6 replies

I'm a complete neophyte when it comes to hardware, so I'm sure I'm doing something completely stupid in the way I am trying to program...

I'm a complete neophyte when it comes to hardware, so I'm sure I'm doing something completely stupid in the way I am trying to program a Freescale HC908QY4CPE. I built the programming circuit shown in the manual and have tried downloading a program using the protocol documented in the manual. I have checked and rechecked connections, voltages, parts. The oscillator is oscillating, the bits...


68HC908 programming 32.768 kHz crystal

Started by galto in comp.arch.embedded19 years ago 2 replies

I am trying to learn the HC908. From what I understand, I require just a MAX232, resistors, jumpers, and a 32.768 kHz crystal, power and serial...

I am trying to learn the HC908. From what I understand, I require just a MAX232, resistors, jumpers, and a 32.768 kHz crystal, power and serial data than I should be ready to go? maybe. Is it possible to program the chip without a higher (8 MHz?) oscillator? IE using the PLL w/o software control. Anyone have any basic circuits that they could recommend to help me get started? Any help is ...


C8051F060?

Started by freekyidea in comp.arch.embedded19 years ago 7 replies

tried to use c0851F060's UART0,but I found there is no output signal from tx0 and rx0(I using crossbar to mapping tx0 rx0 to P_0,P_1),I don't...

tried to use c0851F060's UART0,but I found there is no output signal from tx0 and rx0(I using crossbar to mapping tx0 rx0 to P_0,P_1),I don't know why?,so can anyone remind me that any passable wrong I colud make? p.s my internal oscillator is 24.5Mhz,how can I create baud rate 9600? thanks for gave me advice friends,I still confuse,so I repost this problem.My program as below: ...


Nubie question: Programming ATMEL MEGA8

Started by beef...@dogod.com in comp.arch.embedded18 years ago 3 replies

After looking over a lot of cool projects based on the ATMEL family of microcontroller, I just bought a bunch of ATMGAG8-16PI's. I...

After looking over a lot of cool projects based on the ATMEL family of microcontroller, I just bought a bunch of ATMGAG8-16PI's. I bought these because I was under the impression these where very easy to play with: + On chip RC oscillator, no need for a crystal for simple stuff + Lots of I/O pins with decent source and sink capacity - can light up LED's directly + A/D converter (...


18F452 RC oscillator mode

Started by SebastiaNot in comp.arch.embedded16 years ago 7 replies

I read in ( 18Fxx2 DataSheet ) > > > http://ww1.microchip.com/downloads/en/DeviceDoc/39564c.pdf that I can use a Resistor and a...

I read in ( 18Fxx2 DataSheet ) > > > http://ww1.microchip.com/downloads/en/DeviceDoc/39564c.pdf that I can use a Resistor and a Capacitor to clock the 18f452 PIC Page 18 says (including a diagram) : Recommended values:3 k=A6=B8 =A1=DC REXT =A1=DC 100, CEXT > 20pF But there is not place I can find the achieved clocking related to those values. Any clue ? Sebastian.


20MHz PIC on solderless board?

Started by Louis Levin in comp.arch.embedded19 years ago 4 replies

What is the concensus on using PIC's at 20MHz on a solderless prototyping board? In particular, a 16F628A with external crystal. Purists...

What is the concensus on using PIC's at 20MHz on a solderless prototyping board? In particular, a 16F628A with external crystal. Purists please note, this is just for proof of concept stuff, not fine tuning a design. If there are major problems, is there any way around them? Maybe a few extra bypass caps on the rows tied to the oscillator? Thanks for any advice. Louis


Atmega Internal clock source accuracy

Started by eeh in comp.arch.embedded19 years ago 6 replies

Hi, I find that Atmega internal 1MHz RC clock source is inaccurate. It is about 95% of 1MHz. I used 3V. I have tried to check the...

Hi, I find that Atmega internal 1MHz RC clock source is inaccurate. It is about 95% of 1MHz. I used 3V. I have tried to check the oscillator calibration byte by AVRStudio and then load the value into OSCCAL in the beginning of the program. However, the problem is still present. Could anyone tell me how to calibrate under this condition?


PIC 18 Reset Problem

Started by Tim Wescott in comp.arch.embedded17 years ago 19 replies

I have an odd little problem, I'm hoping one of you could shed some light on it before I spend hours tracking it down. I'm working on a board...

I have an odd little problem, I'm hoping one of you could shed some light on it before I spend hours tracking it down. I'm working on a board with a PIC18F8722. We're setting it up to work in external clock mode with a 40MHz clock. This clock is, in turn, sourced by an integrated oscillator module from ECS (ECS-8FM). The problem that we're seeing is that sometimes the thing comes up ...


TMS320R2811 JTAG communication

Started by Korenje in comp.arch.embedded18 years ago 4 replies

Hello, I have built a board with TMS320R2811 on it. When I power it up oscillator works, and on RS pin I can see the watchdog reset as it...

Hello, I have built a board with TMS320R2811 on it. When I power it up oscillator works, and on RS pin I can see the watchdog reset as it is supposed to, so I assume that the core is alive. But I can not communicate with the DSP, through JTAG with XDS510PP+. I connected all the JTAG pins as they are supposed to (according to ezDSP R2812 schematics). I had no problems with my previous board...


STM32 PWM output accuracy issue.

Started by microe in comp.arch.embedded13 years ago 7 replies

Hello, I've got an STM32F103Z part and I'm trying to generate a PWM output between 10Hz and 20Hz from the timer 1 peripheral. Depending on...

Hello, I've got an STM32F103Z part and I'm trying to generate a PWM output between 10Hz and 20Hz from the timer 1 peripheral. Depending on how I set the timer 1 prescale value (timer 1 is on the 72Mhz high-speed bus), I get more or less accurate output results which can vary by up to 1Hz from the target frequency. The only thing I can think of is that the external oscillator (8Mhz) is off...



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