HT95R22 datasheet(3/52 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 config-

ured as a wake-up input by a configuration option. 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.

PB0~PB3

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 determine which

pins on the port have pull-high resistors.

PC0

I/O

Pull-high

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

CMOS output or Schmitt Trigger input. Configuration options determine which

pins on the port have pull-high resistors. When the multi-function interrupt is en-

abled an interrupt will be generated whenever PC0 has a falling edge. When in the

idle mode such an interrupt will wake up the device.

PC1

I/O

Pull-high

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

CMOS output or Schmitt Trigger input. Configuration options determine which

pins on the port have pull-high resistors.

PC2, PC3

NMOS output structures

PD0~PD3

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 determine which nib-

ble on the port have pull-high resistors.

TMR0/INT

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

low transition. Schmitt Trigger input for Timer/Event Counter 0. No pull-high resis-

tor. For INT edge trigger activated on a falling edge. For TMR0 activated on a fall-

ing or rising transition edge, selected by software.

DTMF

Dual Tone Multi Frequency Output

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

tem 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.

HT95R22

Rev. 1.00

January 6, 2009

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