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MCF5272 User’s Manual
Exception Processing Overview
2.8.1 Exception Stack Frame Definition
The exception stack frame is shown in Figure 2-10. The first longword of the exception
stack frame contains the 16-bit format/vector word (F/V) and the 16-bit status register. The
second longword contains the 32-bit program counter address.
The 16-bit format/vector word contains three unique fields:
•
Format field—This 4-bit field at the top of the system stack is always written with a
value of {4,5,6,7} by the processor indicating a 2-longword frame format. See
Table 2-19. This field records any longword misalignment of the stack pointer that
may have existed when the exception occurred.
•
Fault status field—The 4-bit field, FS[3–0], at the top of the system stack is defined
for access and address errors along with interrupted debug service routines. See
Table 2-20.
31
28
27
26
25
18
17
16
15
0
A7
→
Format
FS[3–2]
Vector[7–0]
FS[1–0] Status
Register
+ 0x04
Program Counter [31–0]
Figure 2-10. Exception Stack Frame Form
Table 2-19. Format Field Encoding
Original A7 at Time of
Exception, Bits 1–0
A7 at First Instruction of
Handler
Format Field Bits
31–28
00
Original A[7–8]
0100
01
Original A[7–9]
0101
10
Original A[7–10]
0110
11
Original A[7–11]
0111
Table 2-20. Fault Status Encodings
FS[3–0]
Definition
0000-001x
Reserved
0100
Error on instruction fetch
0101–011x
Reserved
1000
Error on operand write
1001
Attempted write to write-protected space
101x
Reserved
1100
Error on operand read
1101–111x
Reserved
Содержание DigitalDNA ColdFire MCF5272
Страница 1: ...MCF5272UM D Rev 0 02 2001 MCF5272 ColdFire Integrated Microprocessor User s Manual ...
Страница 38: ...xxxviii MCF5272 User s Manual TABLES Table Number Title Page Number ...
Страница 58: ...1 10 MCF5272 User s Manual MCF5272 Specific Features ...
Страница 90: ...2 42 MCF5272 User s Manual Exception Processing Overview ...
Страница 96: ...3 6 MCF5272 User s Manual MAC Instruction Execution Timings ...
Страница 158: ...5 46 MCF5272 User s Manual Motorola Recommended BDM Pinout ...
Страница 184: ...7 12 MCF5272 User s Manual Interrupt Controller Registers ...
Страница 338: ...13 44 MCF5272 User s Manual Application Examples ...
Страница 414: ...18 6 MCF5272 User s Manual PWM Programming Model ...
Страница 452: ...19 38 MCF5272 User s Manual Power Supply Pins ...
Страница 482: ...20 30 MCF5272 User s Manual Reset Operation ...
Страница 492: ...21 10 MCF5272 User s Manual Non IEEE 1149 1 Operation ...
Страница 548: ...INDEX Index 12 MCF5272 User s Manual ...