LC87F2R04A

No.A1622-10/25

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

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 Type

Mask version

*1

Flash 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.

Recommended Unused Pin Connections

Port Name

Recommended Unused Pin Connections

Board

Software

P00 to P07

Open

Output low

P10 to P17

Open

Output low

P20 to P21

Open

Output low

P70

Open

Output low

CF1

Pulled low with a 100k

Ω resistor or less

General-purpose input port

CF2

Pulled low with a 100k

Ω resistor or less

General-purpose input port

On-chip Debugger Pin Connection Requirements

For the treatment of the on-chip debugger pins, refer to the separately available documents entitled "RD87

on-chip debugger installation manual" and "LC872000 series on-chip debugger pin connection requirements"

Notes on CF1 and CF2 Pins

• When using as general-purpose input ports

Since the CF1 and CF2 pins are configured as CF oscillator pins at system reset time, it is necessary to add a current

limiting resistor of 1k

Ω or greater to the CF2 pin in series when using them as general-purpose input pins.