HT95R65 datasheet(3/82 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 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, 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 determine which

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

enabled an interrupt will be generated whenever 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/TMR0

PC6/TMR1

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 determine which

pins on the port have pull-high resistors. PC1 is also D/A pin for audio output

for driving an external transistor or power amplifier. Pin PC4 and PC6 are

pin-shared with the external timer input pin TMR0 and TMR1 respectively.

PC2, PC3

NMOS output structures

PD0/SCOM0

PD1/SCOM1

PD2/SCOM2

PD3/SCOM3

PD4~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 determine

which nibble on the port have pull-high resistors. PD0~PD3 also support LCD

software COM port function.

PE0/SDO

PE1/SDI/SDA

PE2/SCK/SCL

PE3/SCS

PE4/PCLK/VDDIO

PE5/PINT

PE6~PE7

I/O

Pull-High

Schmitt Trigger input and CMOS output. I

2C and SPI functional pins: SDO,

SDI/SDA, SCK/SCL, SCS, PCLK, PINT are pin-shared with PE0~PE5 re-

spectively. For I

2C, PE2 and PE1 used as SCL and SDA of I2C respectively.

For use as SPI, PE0~PE3 used as SDO, SDI, SCK, SCS of SPI respectively.

SDO is a serial interface data output. SCK is a serial interface clock input/out-

put (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. PE4/PCLK is pin shared with VDDIO which is selected by

configuration option. PE4 I/O function & PCLK output function will be disabled

when this pin used as VDDIO. VDDIO is used to provide the SPI/I

2C interface

I/Os a pull high voltage, set by external power supplier, other than the device

operating voltage. The purpose of this design is to cope with the voltage differ-

ence between Master device and Slave device, such as Voice Flash memory.

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 determine

which nibble 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.

DTMF

Dual Tone Multi Frequency Output

PFD

CMOS output structure Programmable Frequency Divider pin

LBIN

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

voltage.

RT/GT

I/O

Tone acquisition time and release time can be set through connection with ex-

ternal resistor and capacitor CMOS IN/OUT for DTMF receiver.

EST

Early steering output CMOS out for DTMF receiver.

Operational amplifier non-inverting input for DTMF receiver.

Operational amplifier inverting input for DTMF receiver.

Operational amplifier output terminal for DTMF receiver.

HT95R64/HT95R65

Rev. 1.00

March 3, 2010

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