參數(shù)資料
型號(hào): MC16V1CPU20B1
廠商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: 16-BIT, MROM, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝: TQFP-100
文件頁(yè)數(shù): 119/128頁(yè)
文件大?。?/td> 571K
代理商: MC16V1CPU20B1
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MOTOROLA
MC68HC16V1
90
MC68HC16V1TS/D
4.7 Exceptions
An exception is an event that preempts normal instruction process. Exception processing makes the
transition from normal instruction execution to execution of a routine that deals with an exception.
Each exception has an assigned vector that points to an associated handler routine. Exception process-
ing includes all operations required to transfer control to a handler routine, but does not include execu-
tion of the handler routine itself. Keep the distinction between exception processing and execution of an
exception handler in mind while reading this section.
4.7.1 Exception Vectors
An exception vector is the address of a routine that handles an exception. Exception vectors are con-
tained in a data structure called the exception vector table, which is located in the first 512 bytes of bank
0. Refer to Table 49 for the exception vector table.
All vectors except the reset vector consist of one word and reside in data space. The reset vector con-
sists of four words that reside in program space. There are 52 predefined or reserved vectors, and 200
user-defined vectors.
Each vector is assigned an 8-bit number. Vector numbers for some exceptions are generated by exter-
nal devices; others are supplied by the processor. There is a direct mapping of vector number to vector
table address. The processor left shifts the vector number one place (multiplies by two) to convert it to
an address.
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