Jameco Electronics Rabbit 3000 - Manual (Page 324)

User’s Manual 315
Figure B-22. Quadrature Decode, 8-bit and 10-bit Counter Timing
Cnt (8 bit)
Interrupt
I input
Q input
00 01 02 03 04 05 06 07 08 07 06 05 04 03 02 01 00 FF FF
Cnt (10 bit) 000 001 002 003 004 005 006 007 008 007 006 005 004 003 002 001 000 3FF 3FF