MC68030RC33

Manufacturer Part NumberMC68030RC33
DescriptionMC68030RC33ENHANCED 32-BIT MICROPROCESSOR
ManufacturerMotorola
MC68030RC33 datasheet
 
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Exception Processing
(Refer to Section 10 Coprocessor Interface Description for a complete discussion of
coprocessor exceptions.) For all other exceptions, internal logic provides the vector number.
This vector number is used in the last step to calculate the address of the exception vector.
Throughout this section, 9 vector numbers are given in decimal notation.
For all exceptions other than reset, the third step is to save the current processor context.
The processor creates an exception stack frame on the active supervisor stack and fills it
with context information appropriate for the type of exception. Other information may also
be stacked, depending on which exception is being processed and the state of the processor
prior to the exception. If the exception is an interrupt and the M bit of the status register is
set, the processor clears the M bit in the status register and builds a second stack frame on
the interrupt stack.
The last step initiates execution of the exception handler. The processor multiplies the
vector number by four to determine the exception vector offset. It adds the offset to the value
stored in the vector base register to obtain the memory address of the exception vector.
Next, the processor loads the program counter (and the interrupt stack pointer (ISP) for the
reset exception) from the exception vector table in memory. After prefetching the first three
words to fill the instruction pipe, the processor resumes normal processing at the address in
the program counter. Table 8-1 contains a description of all the exception vector offsets
defined for the MC68030.
Table 8-1. Exception Vector Assignments (Sheet 1 of 2)
Vector
Vector Offset
Number(s)
Hex
0
000
1
004
2
008
3
00C
4
010
5
014
6
018
7
01C
8
020
9
024
10
028
11
02C
12
030
13
034
14
038
15
03C
8-2
Assignment
Space
SP
Reset Initial Interrupt Stack Pointer
SP
Reset Initial Program Counter
SD
Bus Error
SD
Address Error
SD
Illegal Instruction
SD
Zero Divide
SD
CHK, CHK2 Instruction
SD
cpTRAPcc, TRAPcc, TRAPV Instructions
SD
Privilege Violation
SD
Trace
SD
Line 1010 Emulator
SD
Line 1111 Emulator
(Unassigned, Reserved)
SD
SD
Coprocessor Protocol Violation
SD
Format Error
SD
Uninitialized Interrupt
MC68030 USER’S MANUAL
STATUS
Asserted
YES
YES
NO
NO
NO
NO
NO
YES
NO
YES
NO
NO
YES
MOTOROLA