Xerox 550 User Manual

STH
STORE HALFWORD
(Halfword
index alignment)
STORE HALFWORD stores tile contents of bit positions 16-31
of register R into the effective halfword location. If the
information in register R exceeds halfword data limits, CC2
is set to 1; otherwise, CC2 is reset·to O.
Affected: (EHL), CC2
(R)16-31- EHL
Condition code settings:
2 3 4 Informati on in R
- 0 (R)0-16 = all O's or all l's.
(R)0-16 I all O's or all l's.
STW STORE WORD
(Word index al.ignment)
o 1 2
STORE WORD stores the contents of register R into the ef-
fective word location.
Affected: (EWL)
(R) -EWL
STO STORE DOUBLEWORD
(Doubleword index alignment)
STORE DOUBLEWORD stores the contents of register R into
the 32 hi gh-order bi t positions of the effecti ve doubleword
location and then stores the contents of register Ru 1 into
the 32 low-order bit positions of the effective doubleword
location.
Affected: (EDL)
(R)·-- EDL
O
_
31
; (RuH - EDL
32
_
63
Example
1,
even R field value:
Before execution
After execution
(R)
X'01234567'
X'01234567'
(Ru1 )
X'89ABCDEF'
X
'
89ABCDEF'
(EDL) =
xxxxxxxxxxxxxxxx
X'O 123456789ABCDEF'
Example 2, odd R field value:
Before execution
(R)
(EDL) = xxxxxxxxxxxxxxxx
STS STORE SE LECTNE
(Word
index alignment)
After execution
X'89ABCDEF89ABCDEP
Register Ru 1 contains a 32-bit mask. If R is an even value,
STORE SE LECTIVE stores the contents of register R into the
effective word location in those bit positions selected by
a 1 in corresponding bit positions of register Ru1; the effec-
tive word remains unchanged in those bit positions selected
by a 0 in corresponding bit positions of register Rul.
If R is an odd value, STS logically inclusive ORs the con-
tents of register R with the effective word and stores the
result into the effective word location. The contents of
register R are not affected.
Affected: (EWL)
If R is even, [(R)n(Rul)] u [EWn(Rul)] -- EWL
If R is odd, (R) u EW - EWL
Example 1, even R field value:
Before executi on
After execution
(R)
X'12345678'
X'12345678'
(Ru1 ) X' FOFOFOFO'
X' FOFOFOFO'
EW
xxxxxxxx
X'lx3x5x7x'
Example 2, odd R field value:
Before execution
After execution
(R) X'OOFFOOFF'
X'OOFFOOFF
'
EW X'12345678'
C' 12FF56FF'
STM
STORE MULTIPLE
(Word
index alignment)
STORE MULTIPLE stores the contents of a sequential set of
registers into a sequential set of word locations. The set of
locations begins with the location pointed to by the effective
word address of STM, and the setof registers begins with reg-
ister R. The set of registers is treated modulo 16 (i. e. f the
Load/Store Instructions 55

Xerox 550 Specifications

General

Brand	Xerox
Model	550
Category	Printer
Language	English