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KSI User Manual
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pull-up resistor. INT2 is disabled in software unless otherwise instructed in a
manual for the custom version. See the interrupt driven programming example.
Remaining MC68153 INT inputs are not connected. The user may connect them
to the on-board pulse rates to generate periodic interrupts without event
processing overhead.
Table 6.9—MC68153 Interrupt Control Register
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
7
6
5
4
3
2
1
0
N/U
N/U
N/U
IRE
N/U
L2
L1
L0
X
X
X
W
X
W
W
W
The least-significant, 3-bit field of the interrupt control register determines the
level at which an interrupt is generated.
Table 6.10—Control Register Interrupt Level
L2
L1
L0
IRQ Level
0
0
0
Disabled
0
0
1
IRQ1*
0
1
0
IRQ2*
0
1
1
IRQ3*
1
0
0
IRQ4*
1
0
1
IRQ5*
1
1
0
IRQ6*
1
1
1
IRQ7*
The IRE field (Bit 4) must be set (high level) to enable the bus interrupt request
associated with the control register. If this bit is cleared a VMEbus interrupt will
not be generated.
Vector Register 3 (offset F) is an eight-bit register within the MC68153 that the
user must program with the interrupt vector number associated with the
TPRO-VME interrupt service routine.
Models TPRO-VME and TSAT-VME Q Synchronizable Timecode Generators
Edition 1.4