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MC68302FC20 Datasheet(PDF) 73 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) 73 Page - Motorola, Inc

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System Integration Block (SIB)
MOTOROLA
MC68302 USER’S MANUAL
3-23
Figure 3-4. SCC1 Vector Calculation Example
Table 3-5. Encoding the Interrupt Vector
Priority
Level
5-Bit
Vector
Interrupt Source
7 (Highest)
10111
External Device
6
10110
External Device
5
None
External Device
4
01111
General-Purpose Interrupt 3 (PB11)
4
01110
General-Purpose Interrupt 2 (PB10)
4
01101
SCC1
4
01100
SDMA Channels Bus Error
4
01011
IDMA Channel
4
01010
SCC2
4
01001
Timer 1
4
01000
SCC3
4
00111
General-Purpose Interrupt 1 (PB9)
4
00110
Timer 2
4
00101
SCP
4
00100
Timer 3
4
00011
SMC1
4
00010
SMC2
4
00001
General-Purpose Interrupt 0 (PB8)
4
00000
Error
3
None
External Device
2
None
External Device
1 (Lowest)
10001
External Device
V7–V5
1 0 1 0 1 1 0 1 0 0 = $2B4
0 1 1 0 1
5-BIT VECTOR
V7–V5 PROGRAMMED BY SOFTWARE IN
THE GIMR.
5-BIT VECTOR FROM TABLE 3-4.
1. FORMULATE 8-BIT VECTOR
2. MULTIPLY BY 4 TO GET ADDRESS
1 0 1
3. READ 32-BIT VALUE AT $2B4 AND JUMP
0007
$2B4
INTERRUPT HANDLER BEGINS AT
$070302 (24-BIT ADDRESSES ARE USED
ON THE M68000).
NOTE THAT $2B4 IS IN THE USER
INTERRUPT VECTOR AREA OF THE
EXCEPTION VECTOR TABLE. V7–V5 WAS
PURPOSELY CHOSEN TO CAUSE THIS.
0302
$2B6


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