HT95A20P datasheet(6/51 Pages) HOLTEK

Part #	HT95A20P

Description	CID Type Phone 8-Bit MCU

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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Pin Name

I/O

Description

LCD Driver

SEG47~SEG0

O

or

I/O

LCD panel segment outputs.

Some segment outputs can be optioned to Bidirectional input/output ports by software.

(See the

²LCD Driver² function)

COM15~COM0

O

or

I/O

LCD panel common outputs.

Some common outputs can be optioned to Bidirectional input/output ports by software.

(See the

²LCD Driver² function)

VLCD

I

LCD driver power source.

Normal I/O

PA7~PA0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high and wake-up function

PB7~PB0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high function

PD7~PD0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high function

Port D could be optioned to LCD signal output, see the

²Input/Output Ports² function

PE3~PE0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high function

Port E could be optioned to LCD signal output, see the

²Input/Output Ports² function

PF7~PF0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high function

PG3~PG0

I/O

Bidirectional input/output ports.

Schmitt trigger input and CMOS output.

See mask option table for pull-high function

Dialer I/O (See the

²Dialer I/O function²)

HFI

I

Schmitt trigger input structure. An external RC network is recommended for input

debouncing.

This pin is pulled low with internal resistance of 200k

W typ.

HFO

O

CMOS output structure.

HDI

I

Schmitt trigger input structure. An external RC network is recommended for input

debouncing.

This pin is pulled high with internal resistance of 200k

W typ.

HDO

O

CMOS output structure.

HKS

I

This pin detects the status of the hook-switch and its combination with HFI/HDI can con-

trol the PO pin output to make or break the line.

PO

O

CMOS output structure controlled by HKS and HFI/HDI pins and which determines

whether the dialer connects or disconnects the telephone line.

DNPO

O

NMOS output structure.

XMUTE

O

NMOS output structure. Usually, XMUTE is used to mute the speech circuit when trans-

mitting the dialer signal.

HT95CXXX

Rev. 1.50

6

May 26, 2005

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HT95A20P Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

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