UPD17P133CS datasheet(44/289 Pages) NEC

44 / 289 page

CHAPTER 4

PROGRAM MEMORY (ROM)

(2) Branch table

Example 2 shows an example of code used to reference a branch table.

Example 2. Code used for reading the values recorded in a branch table. The value specified by

an OFFSET value is read.

OFFSET

MEM

0.00H

; Storing area for the offset address.

; BANK0

MOV

RPH,#0

; Sets the register pointer to row

MOV

RPL,#7 SHL 1

; 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

MOVT

DBF, @AR

; Executes the table reference instruction.

PUT

AR, DBF

@AR

TABLE:

0001H

0002H

0004H

0008H

0010H

0020H

0040H

0080H

0100H

0200H

END

UPD17P133CS Datasheet(PDF) 44 Page - NEC

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