Pin Name

I/O

Description

Normal I/O

PA0~PA7

I/O

Bidirectional 8-bit input/output ports.

Schmitt trigger input or CMOS output.

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

PB0~PB7

I/O

Bidirectional 8-bit input/output ports.

Schmitt trigger input or CMOS output.

See mask option table for pull-high function

PE0~PE3

O

or

I/O

Bidirectional 4-bit input/output ports.

Schmitt trigger input and CMOS output.

PE0~PE3 can be per nibble optioned to SEG16~SEG19 by software.

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

control 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

transmitting the dialer signal.

Peripherals

DTMF

O

This pin outputs dual tone signals to dial out the phone number. The load resistor should

not be less than 5k

W.

MUSIC

O

This pin outputs the single tone that generated by the PFD generator.

LBIN

I

This pin detects battery low through external R1/R2 to determine threshold voltage.

Absolute Maximum Ratings

Supply Voltage ........................................

-0.3V to 5.5V

Storage Temperature ...........................

-50°Cto125°C

Operating Temperature ..........................

-25°Cto70°C

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those

listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-

ity.

HT95L100/10P

Rev. 0.10

4

October 1, 2002

Preliminary