NEC PD17062 - Manual (Page 58)

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PD17062
8.5.2 Functions of Index Register and Data Memory Row Address Pointer
When a data memory manipulation instruction is executed with the index enable flag (IXE) set to 1, the
index register ORs the data memory bank/address specified by the instruction and the contents of the index
register. Then, the index register executes the instruction in the data memory address indicated by the
operation result (in other words, the real address).
When a general-purpose register indirect transfer instruction (MOV @r, m and MOV m, @r) is executed
with the memory pointer enable flag set to 1, the data memory row address pointer executes the instruction,
regarding the indirect address bank specified by the general-purpose register and row address as being the
value of the data memory row address pointer.
Table 8-2 shows the modification of data memory and the indirect address by the index register and data
memory row address pointer.
All data memories are subject to modification by the index register and data memory row address pointer.
The following instructions are not subject to modification by the index register.
INC AR
INC IX
MOVT DBF, @AR
PUSH AR
POP AR
PEEK WR, rf
POKE rf, WR
GET DBF, P
PUT p, DBF
BR addr
BR @AR
RORC r
CALL addr
CALL @AR
RET
RETSK
RETI
EI
DI
STOP 0
HALT h
NOP