LC87FC096A

No.A2150-10/26

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 P27

1 bit

1

CMOS

Programmable

2

Nch-open drain

Programmable

P70

-

No

Nch-open drain

Programmable

P71 to P73

-

No

CMOS

Programmable

P80 to P86

-

No

Nch-open drain

No

PWM2, PWM3

-

No

CMOS

No

P30 to P37

1 bit

1

CMOS

Programmable

2

Nch-open drain

Programmable

PC0 to PC7

1 bit

1

CMOS

Programmable

2

Nch-open drain

Programmable

XT1

-

No

Input for 32.768kHz crystal oscillator (Input only)

No

XT2

-

No

Output for 32.768kHz crystal oscillator

(Nch-open drain when in general-purpose output

mode)

No

Note 1:Programmable pull-up resistors for port 0 are controlled in 4-bit units (P00 to 03, P04 to 07).

*1: Make the following connection to minimize the noise input to the VDD1 pin and prolong the backup time.

Be sure to electrically short the VSS1, VSS2 and VSS3 pins.

(Example 1) When backup is active in the HOLD mode, the high level of the port outputs is supplied by the

backup capacitors.

(Example 2) The high-level output at the ports is unstable when the HOLD mode backup is in effect.

LSI

Power

Supply

VSS1VSS2 VSS3

VDD3

VDD2

VDD1

Power

Supply

VDD3

VDD2

VDD1

LSI

VSS1VSS2VSS3

Back-up

capacitor

Back-up

capacitor