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| 型號： | EC000UM |
| 英文描述： | EC000 Core User＇s Manual (SCM68000) |
| 中文描述： | EC000核心用戶手冊（SCM68000） |
| 文件頁數(shù)： | 142/145頁 |
| 文件大小： | 829K |
| 代理商： | EC000UM |
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Exception Processing
MOTOROLA
EC000 CORE PROCESSOR USER’S MANUAL
4-11
4.2 EXCEPTION PROCESSING DESCRIPTION
The processing of an exception occurs in four steps, with variations for different exception
causes:
1. Make a temporary copy of the status register and set the status register for exception
processing.
2. Obtain the exception vector.
3. Save the current SCM68000 context.
4. Obtain a new context and resume instruction processing.
4.2.1 Exception Vectors
An exception vector is a memory location from which the SCM68000 fetches the address of
a routine to handle an exception. Each exception type requires a handler routine and a
unique vector. All exception vectors are two words in length (see Figure 4-6) and reside in
the supervisor data space, except for the reset vector, which is four words long and resides
in the supervisor program space.
A vector number is an 8-bit number that is multiplied by four to obtain the address of an
exception vector. The SCM68000 forms the vector address by left-shifting the vector num-
ber two bit positions and zero-filling the upper-order bits to obtain a 32-bit long-word vector
address (see Figure 4-7).
The vector numbers can be found in the vector table (see Table 4-2) which is 512 words long
(1024 bytes), starting at address 0 and proceeding through address 1023 (decimal). The
vector table provides 255 unique vectors, some of which are reserved for trap and other sys-
tem function vectors. Of the 255 vectors, 192 are reserved for user interrupt vectors. How-
ever, the first 64 entries are not protected, so user interrupt vectors may overlap at the
discretion of the system designer.
Figure 4-6. Exception Vector Format
A31
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
ALL ZEROES
V7
V6
V5
V4
V3
V2
V1
V0
0
Figure 4-7. Address Translated from 8-Bit Vector Number
NEW PROGRAM COUNTER (HIGH)
NEW PROGRAM COUNTER (LOW)
A1 = 0
A1 = 1
WORD 0
WORD 1
EVEN BYTE (A0 = 0)
ODD BYTE (A0 = 1)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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