>Perhaps you have to find a spare IO pin attached to an LED I made a write-only UART on an ST7. Clocking worked out to 500kbit because that was the first confi

>Perhaps you have to find a spare IO pin attached to an LED I made a write-only UART on an ST7. Clocking worked out to 500kbit because that was the first configuration I found where I could make the mark and space bits take an equals number of cycles. I still remember thinking: why in the world is the timing for each of these instructions so different?