http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008-12-02T00:25:30-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t8953.html 2008-12-02T00:25:30-08:00 hiim now trying to generate a pwm signal (10kHz squarewave signal) using timer/counter0 provided on atmega169.however, the output compare match will generate the waveform on OC0A pin, which is in this case, PB4so in order to let the signal visible on the pin (output), i put this line inDDRB = 0x10;but i kinda have a situation here, cos im attaching the butterfly on my school's development board and it does not give any access to portBso my question is, how do i write the code to let, say Port D Pin 0 (PD0) to output whats on PB4?many thanks in advance http://www.8051projects.net/forum-t8953.html 2008-12-02T00:25:30-08:00 Ajay i think i already gave a thought on this...while in fastPWM avr count up and down and both time when compare occurs state of Output compare pin changes. If you enable the compare interrupt then you can change the state of PortD0 pin in that service routine. try it.. http://www.8051projects.net/forum-t8953.html 2008-12-02T00:25:30-08:00 nuRuL yes but i dont really understandbut this one is more clear i guessi'll try to do it first and see what happensthanks!