HT95R35 datasheet(3/73 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.

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/AUD,

PC4, PC6

I/O

DAC Output

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. PC1 is also D/A pin

for audio output for driving external transistor or power amplifier.

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/SDO

PE1/SCK/SCL

PE2/SCS

PE3/SDI/SDA

PE4/PCLK

PE5/PINT

PE6~PE7

I/O

Pull-High

Schmitt Trigger input and CMOS output. I

2C and SPI functional pins:

SDO, SCK/SCL, SCS, SDI/SDA, PCLK, PINT are pin-shared with PE0~

PE5 respectively.

For I

2C, PE1 and PE3 used as SCL and SDA of I2C respectively.

For use as SPI, PE0~3 used as SDO, SCK, SCS, SDI of SPI respec-

tively. SDO is a serial interface data output. SCK is a serial interface

clock input/output (Initial is input). SCS is a chip select pin of the serial

peripheral interface, input for slave mode and output for master mode.

SDI is a serial interface data input.

PCLK is a peripheral clock. PINT is external peripheral interrupt pin.

Once the SPI/I

2C bus function is used, the PE0~PE3 could not be used

as normal I/O pins.

PF0~PF7

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.

PG0~PG3

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.

RT/GT

I/O

Tone acquisition time and release time can be set through connection

with external resistor and capacitor CMOS IN/OUT

EST

Early steering output CMOS out

Operational amplifier non-inverting input

Operational amplifier inverting input

Operational amplifier output terminal

HT95R35

Rev. 1.00

October 7, 2009

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