Jim Main <PICLIST@MITVMA.MIT.EDU> wrote:

> Are there any resources floating about on how to do this?  The 1994
> data book only has a very small paragraph on  using the 16C74 in
> master mode..
>
> It looks - on first reading - that everything has to be done in
> s/ware - eg rotating a register and setting/clearing the TRISC bits
> to suit.
>
> How do you get the timings right (and provide a clock at the same
> time)
>
> Are the interrupts (for detection of start and stop bits) only of
> use when receiving data back from the eeprom (and do you have to
> disable them for when the master is talking to the slave??)
>
> You'd think Microchip would give some worked examples!

Jim:

They do give examples; you're just looking in the wrong place. Look
in Microchip's "Embedded Control Handbook".

"Getting the timings right" is not an issue; there are no constraints
on the minimum speed of the data transfer, and there's no requirement
for clock pulses to be regularly-spaced.

The interrupts only work when the PIC is operating in slave mode;
they don't help you at all when you're using the PIC in master mode.

-Andy

Andrew Warren - fastfwd@ix.netcom.com
Fast Forward Engineering, Vista, California
http://www.geocities.com/SiliconValley/2499