Real Time Devices AD1200 User Manual page 143

Y
o
N
Y
o
P7
rH
XTAL
EC1
orl
XTAL
EC2
PCK
XTRIG
EOC
DMA
IRQT
IRQ6
IRQs
IRQ4
IRQ3
IRQ2
G
Fig. E-2 - 8254 Timer/Counter
Clock Source Jumpers, p7
P8 - Interrupts
To select an IRQ channel and an intemrpt source, you must install three jumpers on ttris header connector. To
configure this header for ATLANTIS, place one jumper across the pins of your desired IRQ channel, place the
second jumper across the pins labeled OT2, and place third jumper across the pins labeled G. Ivfake certain that there
are no other jumpers on this connector. Also, make sure that ttre IRQ channel you have selected is not used by any
other device in your system. Figure E-3 shows you how to configure P8 for IRQ channel 3.
P8
oT2
Fig. E-3 - lnterrupts and Interrupt ChannelJumpers,
pg