Selecting longer start-up time will eliminate the – 4.8 MHz internal oscillator (CKSEL = 01), shortest start-up timeĪvoid the above fuse combinations. – 9.6 MHz internal oscillator (CKSEL = 10), shortest start-up time
(SUT = 00), Debugwire enabled (DWEN = 0) or Reset disabled – 128 kHz internal oscillator (CKSEL = 11), shortest start-up time The following combinations of settings/fuse bits Special combinations of fuse bits will lock the device for further programming effectively " Device may lock for further programming One more thing - from DS ATtiny13(p.166, errata) I've done DWEN=0 via in-cirquit programmer, than had a successfully debug session with JTAGICE.
Is it matter - how I can set DWEN=0 both via SPI programmer or via JTAGICE in the debug session? I'm assuming that you can go into DW mode in debug? ISP is DISABLED when DW is enabled. You must disable DW FROM WHITHIN a debug session. Quote: Will try disable DWEN with simplified self-made parallel programmer. I tested that the normal JTAG connects and works fine with a Mega128. When attempting to start the debug session, the reset line toggles.
#LASERDRW MAIN PROGRAMMER HAS STOPPED WORKING FREE#
Make sure the reset line is free before continuing." This could be caused by reset line circuitry or disabled debugWIRE interface. Now the timing was correct, so I enabled the DWEN fuse.īut the debugwire does not work, I get a dialogbox when trying to start a debug session saying: I used ISP to set the fuses and program my test program. To avoid waisting more time I desoldered the SMD chip and mounted a new one. It did not work, I read a signature of FF FF FF. I pressed the button in debug mode to disable the DWENįuse. It was running only 8 MHz, so I had to reprogram the fuses to make it run 16MHz. Then I wanted to theck the system clock frequency and made a program loop toggling a port pin. Then I connected the JTAG Debugwire and started some debug sessions. 2 years now with larger AVR's, and now I have made a PCB with a tiny45.įirst I connected the ISP with my STK500 and enabled the DWEN fuse.
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