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MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 157
• There is a 4-bit fault status field, FS[3:0], at the top of the system stack. This field is defined for
access and address errors only and written as zeros for all other exceptions. See Table 7-8.
• The 8-bit vector number, vector[7:0], defines the exception type and is calculated by the processor
for all internal faults and represents the value supplied by the interrupt controller in case of an
interrupt. See Table 7-6.
7.3.2.2 S08 and ColdFire Exception Processing Comparison
This section presents a brief summary comparing the exception processing differences between the S08
and V1 ColdFire processor families.
Table 7-7. Format Field Encodings
Original SSP @ Time
of Exception, Bits 1:0
SSP @ 1st
Instruction of
Handler
Format Field
00 Original SSP - 8 0100
01 Original SSP - 9 0101
10 Original SSP - 10 0110
11 Original SSP - 11 0111
Table 7-8. Fault Status Encodings
FS[3:0] Definition
00xx Reserved
0100 Error on instruction fetch
0101 Reserved
011x Reserved
1000 Error on operand write
1001 Attempted write to write-protected space
101x Reserved
1100 Error on operand read
1101 Reserved
111x Reserved