Omron C500-ASC04, Руководство по эксплуатации, Страница: 74 / 154

63
Integer Type
Higher 8 bits
Lower 8 bits
←
X
Character Type
Length of character string
Address storing argument (higher)
Address storing argument (lower)
←
X
←
X
(MSB is always 1.)
Single-Precision, Real
Number Type
Exponent
Higher 8 bits of mantissa
Middle 8 bits of mantissa
Lower 8 bits of mantissa
Sign (most significant bit)
←
X
(MSB is always 1.)
Double-Precision, Real
Number Type
Exponent
Higher 8 bits of mantissa
Lower 8 bits of mantissa
Sign (most significant bit)
Program Example:
BASIC Program:
100 A$ = &H1234
110 DEF USR0 = &H2000
120 A = USER (A)
130 PRINT A
140 END
Assembly Language Program:
2000 PSHA
2001 PSHX
2002 LDD 2,X
2004 ADD #10
2007 STD 2,X
2009 PULX
2010 PULA
2011 RTS
Program Remarks:
When program execution branches to the assembly language routine, the TYPE
of <argument> is stored in the accumulator A, and the memory address where
the argument is stored is input to the index register X. The value of the argument
is stored in the accumulator D, to whose contents 10 will be added. The result of
the addition is written to the address of <argument>
VARPTR Function
Purpose: Returns the memory address of the variable argument
Commands, Statements, and Functions Section 4-2