Siemens CPU 948 - Page 403

Load and transfer
operations for the dual-port
RAM memory
organized
in words
Operation Operand Description
LW CW
LW CD
TW CW
TW CD
-32768 to
+32767
-32768 to
+32767
-32768 to
+32767
-32768 to
+32767
add the specified constant to content
of the BR register and load the word
addressed in this way in the open page
into ACCU-1-L
1)
add the specified constant to content
of the BR register and load the double
word in the page addessed in this way in
the open page into ACCU 1
2)
add the specified constant to content
of the BR register and transfer the
contents of ACCU-1-L to the word in
the open page addressed in this way.
add the specified constant to content
of the BR register and transfer the
contents of ACCU 1 to the double word
in the open page addressed in this way.
1)
ACCU-1-H is set to ’0’.
2)
ACCU 2
new
: = ACCU 1
old
Error reaction The range of absolute addresses must be
•• between F F400H and F FBFFH (LW CW, TW CW)
or
•• between F F400H and F FBFEH (LW CD, TW CD).
If the absolute addresses are not in the range shown, the system
program detects a load/transfer error (TRAF) and calls OB 32. If
OB 32 is not loaded, the CPU changes to the STOP mode with the
error bit TRAF (ISTACK).
Table 9-12 Operations for access to pages organized as words
Operations with the Base Address Register (BR Register)
CPU 948 Programming Guide
C79000-G8576-C848-04
9 - 33