I'm trying to set up a simple program on an ATMEGA88-20PU, which steps through all 8 bits on portb. The chip sits in my STK500, and I've connected PORTB to LEDS.
However, I can't get LED6 and LED7 to light up. LEDs 0 to 5 scroll as they're supposed to. I understand these are reserved for external clock usage. Connecting a 2-wire jumper from XT1,XT2 (pins 6 and 7 on PORTE) to LED6,LED7, plus connecting GND and VTG from PORTB to LEDS using another jumper, I get the converse effect; LEDs 6 and 7 scroll. But now I can't connect the other 6 LEDs to PORTB; the 10pin header won't fit next to the jumper cables.
Hold on, maybe I've figured out this just by typing it in here! The problem seems to have more to do with the layout of the STK, than the chip itself! I can have all 8 bits of PORTB, but I have to get PB6 and 7 from PORTE, so the main challenge is simply making the necessary connections on the STK. -Which would be straight-forward on a breadboard.