SYS68K/CPU-30 R4 Technical Reference Manual
Hardware Description
Page 73
3.10.8 Interrupt
Request Signals
of PI/T #1
TOUT:
The PI/T #1 pin PC3 is used as an interrupt request output. The 24-bit
timer can generate interrupt requests at a software programmable level.
This interrupt request line is connected to the IRQ #2 of the FGA-002.
PIRQ:
The PI/T #1 pin PC5 may be used as a port interrupt request output.
Normally, this pin is not used. However, PC5 may be used to generate an
additional interrupt if switch SW13-1 is OFF. In this case, the Port
Interrupt Request and the Timer Interrupt Request will use the same
FGA-002 interrupt channel. Therefore, they will generate interrupts at the
same interrupt priority level, and the user's software may need to poll the
PI/T device to determine the actual cause of the interrupt. For
compatibility with earlier boards, this pin is normally not used.
NOTE: There is another timer interrupt signal at PI/T #2 which doesn’t
have anything to do with these signals of PI/T #1.
3.10.9 Floating Point
Coprocessor Sense
Line at PI/T #1
PC6:
This line reports whether or not an FPCP is installed on the CPU board.
3.10.10 Reserved Line
at PI/T #1
PC2:
This line is not used. In order to retain compatibility with earlier and
future versions, this line should not be used in any applications.
SW13-1
Function
OFF (default)
Port Interrupt Disabled
ON
Port Interrupt Enabled
PC6
Function
0
FPCP Installed
1
FPCP Not Installed
i
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