UPD17217GT datasheet(52/84 Pages) NEC

52 / 84 page

µPD17215, 17216, 17217, 17218

Caution: Connect a diode and a capacitor to the RESET pin as shown below to stabilize the operation.

RESET

WDOUT

Micro-

computer

Remark:

In this figure, the RESET pin is connected to a pull-up resistor by the mask option.

11. ASSEMBLER RESERVED WORDS

11.1

Mask Option Directives

When developing the

µ PD17215 program, mask options must be specified by using mask option directives in the

program.

The RESET pin for

µPD17215 requires a mask option to be specified.

11.1.1

OPTION and ENDOP directives

That portion of the program enclosed by the OPTION and ENDOP directives is called a mask option definition block.

This block is described in the following format:

Description:

Symbol

Mnemonic

Operand

Comment

[Label: ]

OPTION

[;Comment]

ENDOP

11.1.2

Mask option definition directives

Table 19-1 lists the directives that can be used in the mask option definition block.

Here is an example of mask option definition:

Description format:

Symbol field

Mnemonic field

Operand field

Comment field

OPTION

OPTRES

PULLUP

; RESET pin has pull-up resistors.

OPTPOC

USEPOC

; Internal low-voltage detector circuit

ENDOP

UPD17217GT Datasheet(PDF) 52 Page - NEC

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