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Load and transfer
operations for the dual-port
RAM memory
organized in words
Error reaction
CPU 948 Programming Guide
C79000-G8576-C848-04
Operations with the Base Address Register (BR Register)
Table 9-12
Operations for access to pages organized as words
Operation
Operand
LW CW
-32768 to
+32767
LW CD
-32768 to
+32767
TW CW
-32768 to
+32767
TW CD
-32768 to
+32767
1)
ACCU-1-H is set to '0'.
2)
ACCU 2
: = ACCU 1
new
old
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).
Description
add the specified constant to content
of the BR register and load the word
addressed in this way in the open page
1)
into ACCU-1-L
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
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.
2)
9 - 33
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