Omega ISA- BUS MULTI-FUNCTIONAL BOARD OME-A822PG - Manual (Page 16)

2.3.6 JP6 : User Timer/Counter Clock Input
Selection
Internal 2M
Clock
(default) INTCLK
EXTCLK
External
Clock INTCLK
EXTCLK
The OME-A-822PGL/PGH has 3 independent 16 bit timer/counters.
The cascaded counter1 and counter2 are used as a pacer timer. Counter0 can
be used as a user programmable timer/counter. The user programmable
timer/counter can be set to 2M internal clock or external clock ExtCLK,
CN3 pin 37. The block diagram is given in section 2.6. The clock source must
be very stable. Using the 2M internal clock is strongly suggested.
The OME-A-822PGL/PGH software driver uses counter0 as a machine
independent timer. If users program calls the A-822_Delay() subroutine,
counter0 will be programmed as a machine independent timer. More detailed
information is provided in section 2.6.
NOTE : if you use A-822_Delay(), the JP6 jumper must
be set to internal 2M clock.
OME-A-822PGL/PGH Hardware Manual ---- 14