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ST20C4 数据表(PDF) 6 Page - STMicroelectronics

部件名 ST20C4
功能描述  Instruction Set Reference Manual
Download  212 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST20C4 数据表(HTML) 6 Page - STMicroelectronics

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1.3
Description
The description section provides an indication of the purpose of the instruction as well
as a summary of the behavior. This includes details of the use of registers, whose
initial values may be used as parameters and into which results may be stored.
Example
The
add instruction contains the following description:
Description: Add Areg and Breg, with checking for overflow.
1.4
Definition
The definition section provides a formal description of the behavior of the instruction.
The behavior is defined in ter ms of its effect on the state of the processor (i.e. the
values in registers and memory before and after the instruction has executed).
The effects of the instruction on registers, etc. are given as relationships of the
following form:
register
′← expression involving registers, etc.
Primed names (e.g. Areg
′ ) represent values after instruction execution, while
unprimed names represent values when instruction execution starts. For example,
Areg represents the value in Areg before the execution of the instruction while Areg
represents the value in Areg afterwards. So, the example above states that the
register on the left hand side becomes equal to the value of the expression on the
right hand side after the instruction has been executed.
The description is written with the main function of the instruction stated first (e .g. the
main function of the
add instruction is to put the sum of Areg and Breg into Areg).
This is followed by the other effects of the instruction (e.g. popping the stack). There is
no temporal ordering implied by the order in which the statements are written.
The notation is described more fully in section 1.7.
Example
The
add instruction contains the following description:
Definition:
Areg
′← Breg +
checked Areg
Breg
′← Creg
Creg
′← undefined
This says that the integer stack is popped and Areg assigned the sum of the values
that were initially in Breg and Areg. After the instruction has executed Breg contains
the value that was originally in Creg, and Creg is undefined.


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