LC87F5NC8A

No.A0929-10/25

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

Options Selected

in Units of

Option Type

Output Type

Pull-up Resistor

1

CMOS

Programmable (Note 1)

P00 to P07

1 bit

2

N-channel open drain

No

1

CMOS

Programmable

P10 to P17

1 bit

2

N-channel open drain

Programmable

1

CMOS

Programmable

P20 to P27

1 bit

2

N-channel open drain

Programmable

1

CMOS

Programmable

P30 to P36

1 bit

2

N-channel open drain

Programmable

P70

-

No

N-channel open drain

Programmable

P71 to P73

-

No

CMOS

Programmable

P80 to P87

-

No

N-channel open drain

No

1

CMOS

Programmable

PA0 to PA5

1 bit

2

N-channel open drain

Programmable

1

CMOS

Programmable

PB0 to PB7

1 bit

2

N-channel open drain

Programmable

1

CMOS

Programmable

PC0 to PC7

1 bit

2

N-channel open drain

Programmable

PE0 to PE7

-

No

CMOS

Programmable

PF0 to PF7

-

No

CMOS

Programmable

SI2P0, SI2P2

SI2P3

-

No

CMOS

No

SI2P1

-

No

CMOS (when selected as ordinary port)

N-channel open drain (When SIO2 data is selected)

No

PWM0, PWM1

-

No

CMOS

No

XT1

-

No

Input only

No

XT2

-

No

Output for 32.768kHz quartz oscillator

N-channel open drain (when in general-purpose No

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, VSS3 and VSS4 pins.

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

backup capacitors.

LSI

Power

Supply

VSS1

Back-up

capacitor

VSS2VSS3

VDD3

VDD2

VDD1

VDD4

VSS4