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4MELFA-BASIC IV
[Explanation]
(1) An input signal is read when referencing this variable.
(2) An output signal is written when assigning a value to this variable.
(3) It is not allowed to reference an output signal by this variable. Use the M_Out variable in order to refer-
ence an output signal.
(4) The variable name can have up to eight characters. Refer to the
that can be used in program" for the characters that can be used.
(5) When mask information is designated, only the specified signal will be validated.
Example) In the above example on the 20th step, the input/output data with a bit width of eight is masked
by 0F in hexadecimal. Thus, if PORT 2 is used thereafter,
•When used as an input signal (M1 = PORT 2):
Numbers 5 to 8 are used for input, and numbers 9 to 12 are always treated as 0.
No. 12
No.5 (Input/output bit No.)
•When used as an output signal (PORT 2 = M1):
Data to be output this time is output to numbers 5 to 8, and the status currently being output is retained at
numbers 9 to 12.
No. 12
Retains the current output status Output data of this time
4-187 Detailed explanation of command words
Invalid Valid
No.5 (Input/output bit No.)
**** 1111
0000 1111
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Page 129, "4.3.6
Types of characters
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