HT95R24 datasheet(3/53 Pages) HOLTEK

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Pin Description

Pad Name

I/O

Options

Description

PA0~PA7

I/O

Pull-high

Wake-up

Bidirectional 8-bit input/output port. Each individual pin on this port can

be configured as a wake-up input by a configuration option. Software in-

structions determine if the pin is a CMOS output or Schmitt Trigger input.

Configuration options determine which pins on the port have pull-high re-

sistors.

PB0~PB7

I/O

Pull-high

Bidirectional 8-bit input/output port.Software instructions determine if the

pin is a CMOS output or Schmitt Trigger input. Configuration options de-

termine which pins on the port have pull-high resistors.

PC0, PC5, PC7 I/O

Pull-high

Bidirectional input/output port. Software instructions determine if the pin

is a CMOS output or Schmitt Trigger input. Configuration options deter-

mine which pins on the port have pull-high resistors. When the

multi-function interrupt is enabled an interrupt will be generated when-

ever PC0 or PC5 has a falling edge, or PC7 has a rising edge.When in

the idle mode such an interrupt will wake up the device.

PC1, PC4, PC6 I/O

Pull-high

Bidirectional input/output port. Software instructions determine if the pin

is a CMOS output or Schmitt Trigger input. Configuration options deter-

mine which pins on the port have pull-high resistors.

PC2, PC3

NMOS output structures

PD0~PD7

I/O

Pull-high

Bidirectional 8-bit input/output port.Software instructions determine if the

pin is a CMOS output or Schmitt Trigger input. Configuration options de-

termine which nibble on the port have pull-high resistors.

PE0~PE3

I/O

Pull-high

Bidirectional 4-bit input/output port.Software instructions determine if the

pin is a CMOS output or Schmitt Trigger input. Configuration options de-

termine if all the pins on the port have pull-high resistors.

INT

External interrupt Schmitt trigger input. Edge trigger activated on high to

low transition. No pull-high resistor.

TMR0

Timer/Event Counter 0 Schmitt trigger input . No pull-high resistor.

TMR1

Timer/Event Counter 1 Schmitt trigger input . No pull-high resistor.

DTMF

Dual Tone Multi Frequency Output

MUSIC

CMOS output structure Programmable Frequency Divider pin.

X1 and X2 are connected to an external 32768Hz crystal or resonator for

the system clock.

¾¾

External low pass filter pin used for the frequency up conversion circuit.

RES

Schmitt trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground.

Note:

Each pin on PA can be programmed through a configuration option to have a wake-up function.

HT95R24

Rev. 1.00

February 17, 2009

HT95R24 データシート(PDF) 3 Page - Holtek Semiconductor Inc

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