UPD17P133CS datasheet(43/289 Pages) NEC

43 / 289 page

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

0.00H

; Storing area for the offset address.

; BANK0

MOV

RPH,#0

; Register pointer 7 is used to specify that

MOV

RPL,#7 SHL 1

; operation results be stored in row address 7.

ROMREF:

; BANK0

; Stores the start address of the constant data

; table in the address register (AR).

MOV

AR3, #.DL.TABLE SHR 12 AND 0FH

MOV

AR2, #.DL.TABLE SHR 8 AND 0FH

MOV

AR1, #.DL.TABLE SHR 4 AND 0FH

MOV

AR0, #.DL.TABLE AND 0FH

ADD

AR0, OFFSET

; Adds the offset address.

ADDC

AR1, #0

ADDC

AR2, #0

ADDC

AR3, #0

MOVT

DBF, @AR

; Executes the table reference instruction.

TABLE:

0001H

0002H

0004H

0008H

0010H

0020H

0040H

0080H

0100H

0200H

0400H

0800H

1000H

2000H

4000H

8000H

END

UPD17P133CS Datasheet(PDF) 43 Page - NEC

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