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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁(yè)

  • NEC   NEC

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CHAPTER 4
PROGRAM MEMORY (ROM)
(1) Constant data table
Example 1 shows an example of code used to reference a constant data table.
Example 1. Code used for reading the values recorded in a constant data table. The value specified
by an OFFSET value is read.
OFFSET
MEM
; BANK0
MOV
MOV
ROMREF:
; BANK0
; Stores the start address of the constant data
; table in the address register (AR).
MOV
MOV
MOV
MOV
ADD
ADDC
ADDC
ADDC
MOVT
TABLE:
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
END
0001H
0002H
0004H
0008H
0010H
0020H
0040H
0080H
0100H
0200H
0400H
0800H
1000H
2000H
4000H
8000H
AR3, #.DL.TABLE SHR 12 AND 0FH
AR2, #.DL.TABLE SHR 8 AND 0FH
AR1, #.DL.TABLE SHR 4 AND 0FH
AR0, #.DL.TABLE AND 0FH
AR0, OFFSET
AR1, #0
AR2, #0
AR3, #0
DBF, @AR
; Executes the table reference instruction.
; Adds the offset address.
RPH,#0
RPL,#7 SHL 1
; Register pointer 7 is used to specify that
; operation results be stored in row address 7.
0.00H
; Storing area for the offset address.
28

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