[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Opinions about documentation
I have two points regarding the excellent documentation.
1. I would like to see some more details concerning the multiplexing of the IO pins.
I cannot work out exactly what combinations are available, For example if you
use the ATA interface but only with one ATA device intrq2/3 and dior2/3 lines
are not used. Can these lines be used by Async serial port 3. Table 17.1 shows
pin assignment priority for general port B but I cannot find a similar table to
for general IO pins which would answer this question.
2. If I am reading the electrical information correctly you can interface 5V signals
directly to the IO pins. This is an excellent feature. I am used to micros with standard
CMOS input protection diodes to VDD and GND. You must be using a different
arrangement and I wondered if it would be possible to include a block diagram
of a typical IO pin.