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| 型號(hào)： | SPAKMC332GMPV16 |
| 廠(chǎng)商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁(yè)數(shù)： | 17/265頁(yè) |
| 文件大?。?/td> | 6905K |
| 代理商： | SPAKMC332GMPV16 |
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MC68332
CENTRAL PROCESSING UNIT
USER’S MANUAL
5-15
Sources of external exception include interrupts, breakpoints, bus errors, and reset re-
quests. Interrupts are peripheral device requests for processor action. Breakpoints are
used to support development equipment. Bus error and reset are used for access con-
trol and processor restart.
5.9.3 Exception Processing Sequence
For all exceptions other than a reset exception, exception processing occurs in the fol-
lowing sequence. Refer to 4.6 Reset for details of reset processing.
As exception processing begins, the processor makes an internal copy of the status
register. After the copy is made, the processor state bits in the status register are
changed — the S bit is set, establishing supervisor access level, and bits T1 and T0
are cleared, disabling tracing. For reset and interrupt exceptions, the interrupt priority
mask is also updated.
Next, the exception number is obtained. For interrupts, the number is fetched from
CPU space $F (the bus cycle is an interrupt acknowledge). For all other exceptions,
internal logic provides a vector number.
Next, current processor status is saved. An exception stack frame is created and
placed on the supervisor stack. All stack frames contain copies of the status register
and the program counter for use by RTE. The type of exception and the context in
which the exception occurs determine what other information is stored in the stack
frame.
Finally, the processor prepares to resume normal execution of instructions. The ex-
ception vector offset is determined by multiplying the vector number by four, and the
offset is added to the contents of the VBR to determine displacement into the excep-
tion vector table. The exception vector is loaded into the program counter. If no other
exception is pending, the processor will resume normal execution at the new address
in the PC.
5.10 Development Support
The following features have been implemented on the CPU32 to enhance the instru-
mentation and development environment:
M68000 Family Development Support
Background Debugging Mode
Deterministic Opcode Tracking
Hardware Breakpoints
5.10.1 M68000 Family Development Support
All M68000 Family members include features to facilitate applications development.
These features include the following:
Trace on Instruction Execution — M68000 Family processors include an instruction-
by-instruction tracing facility as an aid to program development. The MC68020,
MC68030, MC68040, and CPU32 also allow tracing only of those instructions
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPAKMC332GVFC16 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:32-Bit Modular Microcontroller |
| SPAKMC332GVFC20 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:32-Bit Modular Microcontroller |
| SPAKMC332GVFV16 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:32-Bit Modular Microcontroller |
| SPAKMC332GVFV20 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:32-Bit Modular Microcontroller |
| SPAKMC332MFC16 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:32-Bit Modular Microcontroller |
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