#279 PIC16f170x COG module does not match datasheet

[Robert Pearce]

I'm currently reworking my 16F1705 project to use the Complimentary Output Generator (in place of the CLC) and struggling to get the simulation results I expect. It looks like GPSim doesn't match the datasheet in at least a few ways:

• The datasheet says that the LD bit is auto-cleared by an edge. This doesn't seem to happen
• In half-bridge mode, outputs A and B are a complimentary pair according to the datasheet but are driven identically by GPSim
• It looks like GPSim uses the RIS register for both rising and falling edge sources

There are probably others. I will, of course, check against real hardware before committing any fixes

[Robert Pearce]

I've checked in quite a few fixes at r2582 but there are more bits that still need attention