AVR ATMEGA162 PDF

Whole circuit is powered from USB, nF caps are added to power lines. Inside runs bootloader, starting from 1C Problem is, microcontroller usually not starts. To eliminate problem in bootloader I'm setting PC5 high in first line, just to check if uC started or not. When uC is "freezed" the voltage on reset pin is about 4. Clock signal is there I'm using external clock generator - 16MHz, amplitude 5.

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Whole circuit is powered from USB, nF caps are added to power lines. Inside runs bootloader, starting from 1C Problem is, microcontroller usually not starts. To eliminate problem in bootloader I'm setting PC5 high in first line, just to check if uC started or not. When uC is "freezed" the voltage on reset pin is about 4. Clock signal is there I'm using external clock generator - 16MHz, amplitude 5.

Funny is, my co-manufacturer made about boards, which works flawlessly, only last batch facing that problem It can only be one of 2 things: The firmware or the hadware and we don't know how either looks like. I've a primitive 20MHz osciloscope and the waveform of clocksignal looks more like sine than square.

Could it be a problem? Maybe someone knows the required clock signal's parameters rise time, duty cycle etc Sine wave is ok.. I presume you have 22pf bypass caps each side of the XTAL You could try changing the reset cap to 10uF Only after some power replugging uC starts.

Clock signal is always there. You said you measured XTAL1 input at 2. Is this the problem? I don't know the SJA For same issue I decide to change the crystal with an hybrid TTL oscillator.

I used a tiny26, first two batch of board production no problem, from the third I had the same problem The crystal and caps were always the same. I explained the problem to Atmel, but they never told me an answer Skip to main content. ATmega reset problem. Log in or register to post comments. Go To Last Post. Level: New Member. Posts: 6 View posts. Posted by Mateoosh : Thu. Jul 29, - AM. Fivestar widget 1 2 3 4 5. When finally uC starts, works absolutely correctly.

Any help will be greatly appreciated. BR Mati. Last Edited: Tue. Aug 3, - AM. Level: Moderator. Posts: View posts. Posted by js : Thu. John Samperi Ampertronics Pty. Log in or register to post comments Top. Level: Wannabe. Posts: 92 View posts. Posted by runblade : Thu. Try to change clock source. Try with 16mhz hybrid oscillator ttl out connect to xtal1. Posted by Mateoosh : Tue. Hi, last night I made some further investigations, and with internal rc oscillator uC starts everytime, so it's definitely the clock problem.

Level: Resident. Posted by chartman : Tue. Clock signal is always there I'm out of ideas now I described 2. Amplitude is about 5. SJA is powered from 5V, crystal connected with 15pF caps. Anyway, will replace the crystal and caps, we will see if it helps.

Posted by runblade : Wed. Aug 4, - PM. Posted by js : Wed. Is the Mega fuse OFF?

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ATMEL/AVR - ATMEGA162-16AU

By executing instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed. IAR offers a completely integrated development environment incorporating a compiler, an assembler, a linker and a debugger. Finding the right compiler to support your device is simple:. This collection includes compiler, assembler, linker and Standard C and math libraries. Most of these tools are based on efforts from GNU www. For more information please refer to the release notes.

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ATMEGA162 Datasheet PDF

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