Microcomputer Systems MSI-P602 User Manual page 9

4) JP1-12 is connected to the interrupt request signal of the
secondary UART (TAIP/NMEA protocol). This can jumpered to
a desired interrupt, IRQ4 thru IRQ9, of JP1. The signal is a tri-
state gate which permits connecting multiple sources to the
same IRQx interrupt.
5) Three 1 KOhm pulldown resistors are available for use with
interrupts generated by 1 PPS and the serial ports. JP1-6,
JP1-8 and JP1-10 are connected to 1 KOhm resistors, as
shown in Fig. 4. These can be used to pulldown the IRQx
interrupts. The pulldown resistors and interrupts IRQx are
usually connected using wire-wrap connections. If no 1K
pulldown resistor is provided for a given IRQx to be used (either
by the processor card or by another card in the system sharing
this IRQx), then one of the available 1K pulldowns of JP1-6 , etc.
should be interconnected with the interrupt source and the
chosen IRQx. For example, suppose the NMEA signal is to
interrupt the processor via IRQ5 and no 1K pulldown is
provided elsewhere. A wire-wrap chain could be connected from
JP1-12 to JP1-8 to JP1-7.
Figure 4. Interrupt jumper block JP1 configuration.
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MSI-P602 User Manual