B&B Electronics WOP-2121V-N4AE - Manual - Manual (Page 420)

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PM Designer Operation Manual
14-11
CHAPTER 14 USING MACROS
Terminology Definition
External variable An address or a tag referring to an address of a space in the external memory.
External bit variable An external variable that refers to a bit in the external memory.
For easy to read, we usually use “external variable” instead of “external bit variable” when
referring to a bit if there is no ambiguity.
External word
variable An external variable that refers to a word in the external memory.
The variables can also be used to refer to a double-word, a block of bytes (byte array), a
block of words (word array), and a block of double-words (double-word array) if the access
unit of the associated addresses is word. If the access unit is double-word, you can only use
the variable to refer to a double-word or a block of memory space with a length of a multiple
of 4 (bytes).
For easy to read, we usually use “external variable” instead of “external word variable” when
referring to a word or a block of memory space if there is no ambiguity,
Expression
Type Abbreviation Description
Arithmetic
Expression AE Sequences of operators and parameters that are
used for computing a value from the parameters.
Comparison
Expression CE Sequences of operators and parameters that are
used for comparing value from the parameters.
PM Designer provides the following types of operators for macro expressions:
Operators Name or Meaning Grouping Used for
( ) Parentheses Left to right AE/CE
* Multiplication Left to right
/ Division Left to right
% Modulus Left to right
+ Addition Left to right
- Subtraction Left to right
<< Left shift Left to right
>> Right shift Left to right
AE
< Less than Left to right
> Greater than Left to right
<= Less than or equal to Left to right
>= Greater than or equal to Left to right
== Equality Left to right
!= Inequality Left to right
CE
& Bitwise AND Left to right
^ Bitwise exclusive OR Left to right
| Bitwise inclusive OR Left to right
AE
&& Logical AND Left to right CE
|| Logical OR Left to right CE
= Assignment Right to left AE/CE
Note: The above table lists the operators in order of precedence (from highest to lowest
precedence). Operators in the same segment of the table have equal precedence and are
evaluated in the given order in an expression unless explicitly forced by parentheses.