LC88F58B0A

No.A1951-10/31

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 No.

Output Type

Pull-up Resistor

1

CMOS

P00 to P07

P10 to P17

P20 to P27

P30 to P33

P40 to P47

P60 to P67

P70 to P72

PA0 to PA3

1 bit

2

N-channel open drain

PC2

-

-

CMOS

Programmable

PC0

-

-

N-channel open drain

(32.768kHz crystal oscillator input)

None

PC1

-

-

N-channel open drain

(32.768kHz crystal oscillator output)

None

* 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 data is being backed up in the HOLD mode, the H level signals to the output ports are fed by the

backup capacitors.

Example 2: When data is being backed up in the HOLD mode, the H level output at any ports is not sustained and is

unpredictable.

Power

supply

For buckup

LSI

VSS1VSS2VSS3

VDD3

VDD2

VDD1

+

-

1k

Ω

2.2

μF

PC2/FILT

VDD3

VDD2

VDD1

LSI

VSS1VSS2VSS3

+

-

1k

Ω

2.2

μF

PC2/FILT

Power

supply

For buckup