LC87FBG08A

No.A2046-11/30

Continued from preceding page.

Pin Name

I/O

Description

Option

RES

I/O

External reset input / internal reset output

No

CF1/XT1

I

• Ceramic resonator or 32.768kHz crystal oscillator input pin

• Pin function

General-purpose input port

No

CF2/XT2

I/O

• Ceramic resonator or 32.768kHz crystal oscillator output pin

• Pin function

General-purpose I/O port

No

Port Output Types

The table below lists the types of port outputs and the presence/absence of a pull-up resistor.

Data can be read into any input port even if it is in the output mode.

Port Name

Option selected in

units of

Option type

Output type

Pull-up resistor

P00 to P07

1 bit

1

CMOS

Programmable (Note 1)

2

Nch-open drain

No

P10 to P17

1 bit

1

CMOS

Programmable

2

Nch-open drain

Programmable

P20 to P21

1 bit

1

CMOS

Programmable

2

Nch-open drain

Programmable

P70

-

No

Nch-open drain

Programmable

CF2/XT2

-

No

Ceramic resonator/32.768kHz crystal resonator

output Nch-open drain

(N-channel open drain when set to general-purpose

output port)

No

Note 1: The control of the presence or absence of the programmable pull-up resistors for port 0 and the switching

between low-and high-impedance pull-up connection is exercised in nibble (4-bit) units (P00 to 03 or

P04 to 07).

User Option Table

Option Name

Option to be Applied on

Mask version

*1

Flash-ROM

Version

Option Selected in

Units of

Option Selection

Port output type

P00 to P07





1 bit

CMOS

Nch-open drain

P10 to P17





1 bit

CMOS

Nch-open drain

P20 to P21





1 bit

CMOS

Nch-open drain

Program start

address

-

×

*2



-

00000h

01E00h

Low-voltage

detection reset

function

Detect function





-

Enable:Use

Disable:Not Used

Detect level





-

7-level

Power-on reset

function

Power-On reset level





-

8-level

*

1: Mask option selection - No change possible after mask is completed.

*

2: Program start address of the mask version is 00000h.