UPD64 datasheet(47/68 Pages) NEC

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µPD63, 63A, 64

10. ASSEMBLER RESERVED WORDS

10.1 Mask Option Directives

When creating the

µPD63 program, it is necessary to use a mask option directive in the assembler’s source

program to specify a mask option.

10.1.1 OPTION and ENDOP directives

From the OPTION directive on to the ENDOP directive are called the mask option definition block. The format

of the mask option definition block is as follows:

Format

Symbol field

Mnemonic field

Operand field

Comment field

[Label:]

OPTION

[; Comment]

ENDOP

10.1.2 Mask option definition directive

The directives that can be used in the mask option definition block are listed in Table 10-1.

An example of the mask option definition is shown below.

Example

Symbol field

Mnemonic field

Operand field

Comment field

OPTION

USEPOC

; POC circuit incorporated

ENDOP

Table 10-1. List of Mask Option Definition Directives

Name

Mask Option Definition Directive

PRO File

Address value

Data value

POC

USEPOC

2044H

(POC circuit incorporated)

NOUSEPOC

(Without POC circuit)

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