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MC68302FC20 Datasheet(PDF) 66 Page - Motorola, Inc

Part No. MC68302FC20
Description  Integrated Multiprotocol Processor User’s Manual
Download  480 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MC68302FC20 Datasheet(HTML) 66 Page - Motorola, Inc

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System Integration Block (SIB)
3-16
MC68302 USER’S MANUAL
MOTOROLA
• DTACK Generation When Vectors Supplied Internally
Figure 3-2. Interrupt Controller Block Diagram
3.2.1 Overview
An overview of IMP interrupt processing is presented in the following paragraphs.
3.2.1.1 IMP Interrupt Processing Overview
Interrupt processing on the IMP involves four steps. A typical sequence of these four steps
is as follows:
1. The interrupt controller on the IMP collects interrupt events from on and off-chip pe-
ripherals, prioritizes them, and presents the highest priority request to the M68000
core.
2. The M68000 responds to the interrupt request by executing an interrupt acknowledge
SCC1 EVENT
REGISTER
(8 BITS)
SCC1 MASK
REGISTER
(8 BITS)
SCC2 EVENT
REGISTER
(8 BITS)
SCC2 MASK
REGISTER
(8 BITS)
SCC3 EVENT
REGISTER
(8 BITS)
SCC3 MASK
REGISTER
(8 BITS)
PB8-PB11
DMA
SMCs
SCP
TIMERS
M68000 CORE
DATA BUS
3
2
4
2
IRQ7/
IPL2
IRQ1/
IPL0
IRQ6/
IPL1
VECTOR
GENERATION
LOGIC
INTERRUPT
PRIORITY
RESOLVER
1
IPL2–IPL0 TO
M68000 CORE
IACK1
IACK6
IACK7
1
1
1


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