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Basic I/O Unit Instructions Section 3-21
3-21 Basic I/O Unit Instructions
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
I/O REFRESH
IORF
@IORF
097
Output
Required
7-SEGMENT
DECODER
SDEC
@SDEC
078
Output
Required
INTELLIGENT I/O
READ
IORD
@IORD
222
Output
Required
St: Starting word
E: End word
IORF(097)
St
E
I/O bit area or
Special I/O Unit bit area
I/O Unit or
Special I/O Unit
I/O refreshing
St
E
Refreshes the specified I/O words.
S: Source word
Di: Digit
designator
D: 1st destination
word
SDEC(078)
S
Di
D
Number of digits
First digit to convert
Rightmost 8 bits (0)
Di
7-segment
Converts the hexadecimal contents of the designated digit(s) into 8-bit,
7-segment display code and places it into the upper or lower 8-bits of the
specified destination words.
C: Control data
S: Transfer
source and
number of words
D: Transfer
destination and
number of words
IORD(222)
C
S
D
Desig-
nated
number
of words
read.
S
S+1
Unit number of Special I/O Unit
Reads the contents of the I/O Unit's memory area.
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