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參數(shù)資料
| 型號(hào)： | M68EC000 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 16/32 Bit Microprocesso(16/32位微處理器) |
| 中文描述： | 16/32位Microprocesso（16/32位微處理器） |
| 文件頁(yè)數(shù)： | 89/184頁(yè) |
| 文件大?。?/td> | 1006K |
| 代理商： | M68EC000 |
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6-4
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
6.2 EXCEPTION PROCESSING
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 processor context.
4. Obtain a new context and resume instruction processing.
6.2.1 Exception Vectors
An exception vector is a memory location from which the processor 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 6-1), except for
the reset vector, which is four words long. All exception vectors reside in the supervisor
data space, except for the reset vector, which is in the supervisor program space. A vector
number is an 8-bit number that is multiplied by four to obtain the offset of an exception
vector. Vector numbers are generated internally or externally, depending on the cause of
the exception. For interrupts, during the interrupt acknowledge bus cycle, a peripheral
provides an 8-bit vector number (see Figure 6-2) to the processor on data bus lines D7–
D0.
The processor forms the vector offset by left-shifting the vector number two bit positions
and zero-filling the upper-order bits to obtain a 32-bit long-word vector offset. In the
MC68000, the MC68HC000, MC68HC001, MC68EC000, and the MC68008, this offset is
used as the absolute address to obtain the exception vector itself, which is shown in
Figure 6-3.
NOTE
In the MC68010, the vector offset is added to the 32-bit vector
base register (VBR) to obtain the 32-bit absolute address of
the exception vector (see Figure 6-4). Since the VBR is set to
zero upon reset, the MC68010 functions identically to the
MC68000, MC68HC000, MC68HC001, MC68EC000, and
MC68008 until the VBR is changed via the move control
register MOVEC instruction.
NEW PROGRAMCOUNTER (HIGH)
NEW PROGRAMCOUNTER (LOW)
A1=0
A1=1
WORD 0
WORD 1
EVEN BYTE (A0=0)
EVEN BYTE (A0=0)
Figure 6-1. Exception Vector Format
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M68HC16 | 16-Bit Microcontroller(16位微控制器) |
| MAC08BT1 | TRIAC 0.8 AMPERE RMS 200 thru 600 Volts |
| MAC08MT1 | SENSITIVE GATE TRIACS |
| MAC08DT1 | TRIAC 0.8 AMPERE RMS 200 thru 600 Volts |
| MAC08MT1 | TRIAC 0.8 AMPERE RMS 200 thru 600 Volts |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M68EM05F32 | 制造商:Motorola Inc 功能描述: |
| M68EM05J1A | 制造商:Freescale Semiconductor 功能描述:Tools Development kit For Use |
| M68EM08AS/AZ60A | 功能描述:仿真器/模擬器 EMULATION MODULE RoHS:否 制造商:Blackhawk 產(chǎn)品:System Trace Emulators 工具用于評(píng)估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
| M68EM08AS/AZ60AE | 功能描述:仿真器/模擬器 EMULATION MODULE RoHS:否 制造商:Blackhawk 產(chǎn)品:System Trace Emulators 工具用于評(píng)估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
| M68EM08JB8E | 功能描述:仿真器/模擬器 EMULATION BOARD RoHS:否 制造商:Blackhawk 產(chǎn)品:System Trace Emulators 工具用于評(píng)估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
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