Microcomputer Systems MSI-P602 Manuel d'utilisateur télécharger pdf (Page 8)

as shown in Fig. 4. JP1-2 can be jumpered to a desired

interrupt, IRQ4 thru IRQ9 of JP1, using a wire-wrap type

connection. A 1K Ohm resistor is available for pulling down this

interrupt connection by installing a jumper from JP1-4 to

JP1-6.

D. Digital I/O Registers and Connections.

Four digital TTL inputs and four digital TTL outputs are provided

by the modem status and modem control registers of UART

U5. These I/O are connected to the card via J1 using a 16-pin

flat cable connector. Register designations and connector J1

pin assignments are given in Table 2. The inputs and outputs

on connector J1 are the inverted values of those read or written

in the modem status and control registers. For example, a 1

written to OUT1 of U4 results in a 0 at J1-1 (OUT1_BUFFERED).

Similarly, a 1 applied to J1-9 (IN1) results in a 0 being read in

CTS of U4.

o o o o o o

IRQ9 1 2 1PPS

IRQ7 3 4

IRQ6 5 6 1 KOhm

IRQ5 7 8 1 KOhm

IRQ4 9 10 UART

IRQ3 11 12 (U5)

Figure 4. Interrupt jumper block JP1 configuration.

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Microcomputer Systems MSI-P602 Manuel d'utilisateur Page 8