Technical data

Note
Load operations
do not affect the condition codes.
Transfer operations clear the OS bit.
When a
byte or word is loaded the extra bits are cleared
in ACCU 1.
Example 2:
Fig. 3-7 illustrates the loading/transfer of a byte, word or double word
from/into a memory area organized in
words.
:L DR i load the right byte of data word i into ACCU-1-LL
:L DL j load the left byte of data word j into ACCU-1-LL
:L DW k load data word k into ACCU-1-L
:L DD l load data words l and l+1 into ACCU 1
l
l+1
k
31 23 15 7 0
31 23 15 7 0
31 15 0
31
15 0
ACCU 1
ACCU 1
ACCU 1
ACCU 1
15 0
l l+1
k
j
0
00i
000
1) 1) 1)
0
1) 1) 1)
1)
left byte
Data word j
LDRi
TDRi
LDLj
TDLj
LDWk
TDWk
LDDl
TDDl
right byte
Data word i
Addresses
in
ascending
order
1)
only with load operations
Fig. 3-7 Load and transfer operations in a word-oriented memory area
Basic Operations
CPU 928B Programming Guide
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