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| 型號(hào)： | MC68020RC16E |
| 廠商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 114/306頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU 32BIT 16MHZ 114-PGA |
| 標(biāo)準(zhǔn)包裝： | 14 |
| 系列： | M680x0 |
| 處理器類型： | M680x0 32-位 |
| 速度： | 16MHz |
| 電壓： | 5V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 114-BPGA |
| 供應(yīng)商設(shè)備封裝： | 114-PGA（34.54x34.54） |
| 包裝： | 托盤 |
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MOTOROLA
M68020 USER’S MANUAL
7- 47
described in Section 6 Exception Processing. The vector number for the exception is
taken from the vector number field of the primitive, and the MC68020/EC020 uses the
four-word stack frame format shown in Figure 7-41.
0
11
12
15
STATUS REGISTER
0
VECTOR NUMBER
PROGRAM COUNTER
+06
+02
SP
Figure 7-41. MC68020/EC020 Preinstruction Stack Frame
The value of the PC saved in this stack frame is the F-line operation word address of the
coprocessor instruction during which the primitive was received. Thus, if the exception
handler routine does not modify the stack frame, an RTE instruction causes the
MC68020/EC020 to return and reinitiate execution of the coprocessor instruction.
The take preinstruction exception primitive can be used when the coprocessor does not
recognize a value written to either its command CIR or condition CIR to initiate a
coprocessor instruction. This primitive can also be used if an exception occurs in the
coprocessor instruction before any program-visible resources are modified by the
instruction operation. This primitive should not be used during a coprocessor instruction if
program-visible resources have been modified by that instruction. Otherwise, since the
MC68020/EC020 reinitiates the instruction when it returns from exception processing, the
restarted instruction receives the previously modified resources in an inconsistent state.
One of the most important uses of the take preinstruction exception primitive is to signal
an exception condition in a cpGEN instruction that was executing concurrently with the
main processor's instruction execution. If the coprocessor no longer requires the services
of the main processor to complete a cpGEN instruction and if the concurrent instruction
completion is transparent to the programming model, the coprocessor can release the
main processor by issuing a primitive with CA = 0. The main processor usually executes
the next instruction in the instruction stream, and the coprocessor completes its operations
concurrently with the main processor operation. If an exception occurs while the
coprocessor is executing an instruction concurrently, the exception is not processed until
the main processor attempts to initiate the next general or conditional instruction. After the
main processor writes to the command or condition CIR to initiate a general or conditional
instruction, it then reads the response CIR. At this time, the coprocessor can return the
take preinstruction exception primitive. This protocol allows the main processor to proceed
with exception processing related to the previous concurrently executing coprocessor
instruction and then return and reinitiate the coprocessor instruction during which the
exception was signaled. The coprocessor should record the addresses of all general
category instructions that can be executed concurrently with the main processor and that
support exception recovery. Since the exception is not reported until the next coprocessor
instruction is initiated, the processor usually requires the instruction address to determine
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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| MC68020RC16E | 制造商:Freescale Semiconductor 功能描述:Microcontroller IC Clock Speed:16MHz |
| MC68020RC20 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:The first full 32-bit implementation of the M68000 family of microprocessors from Motorola |
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| MC68020RC20E | 功能描述:微處理器 - MPU 32-BIT MPU RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| MC68020RC25 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:The first full 32-bit implementation of the M68000 family of microprocessors from Motorola |
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