NEC mPD17120 Subseries, User Manual

Page: 218 / 289

CHAPTER 18 INSTRUCTION SET
203
<3> Example 1
Subtracts the address 0.2FH contents from the address 0.03H contents, and stores the result in address
0.03H, when row address 0 (0.00H-0.0FH) in bank 0 is specified as a general register (RPH=0, RPL=0):
(0.03H)
←
(0.03H) + (0.2FH)
MEM003 MEM 0.03H
MEM02F MEM 0.2FH
SUB MEM003, MEM02F
Example 2
Subtracts the address 0.2FH contents from the address 0.23H contents, when row address 2 (0.20H-0.2FH)
in bank 0 is specified as the general register (RPH=0, RPL=4), and stores the result in address 0.23H:
(0.23H)
←
(0.23H) – (0.2FH)
MEM023 MEM 0.23H
MEM02F MEM 0.2FH
MOV BANK, #00H ; Data memory bank 0
MOV RPH, #00H ; General register bank 0
MOV RPL, #04H ; General register row address 2
SUB MEM023, MEM02F
Example 3
Subtracts the address 0.6FH contents from the address 0.03H contents and stores the result in address
0.03H. At this time, data memory address 0.6FH can be specified by selecting data memory address 2FH,
if IXE=1, IXH=0, IXM=4, and IXL=0, i.e., IX=0.40H.
(0.03H)
←
(0.03H) + (0.6FH)
MEM003 MEM 0.03H
MEM02F MEM 0.2FH
MOV BANK, #00H ; Data memory bank 0
MOV RPH, #00H ; General register bank 0
MOV RPL, #00H ; General register row address 0
MOV IXH, #00H ; IX
←
00001000000B (0.40H)
MOV IXM, #04H ;
MOV IXL, #00H ;