HT45F4M View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT45F4M

Lithium Battery Backup Power ASSP MCU

Holtek Semiconductor 

HT45F4M

Lithium Battery Backup Power ASSP MCU

Pin Description

With the exception of the power pins and some relevant transformer control pins, all pins on these

devices can be referenced by their Port name, e.g. PA.0, PA.1 etc, which refer to the digital I/O

function of the pins. However these Port pins are also shared with other function such as the Analog

to Digital Converter, Timer Module pins etc. The function of each pin is listed in the following table,

however the details behind how each pin is configured is contained in other sections of the datasheet.

Pin Name

Function

OPT

I/T

O/T

Pin-Shared

Mapping

PA0~PA7

General purpose I/O port A

PAPU

PAWU

ST CMOS

—

PB0~PB7

General purpose I/O port B

PBPU ST CMOS

—

OVP

Over voltage protection input

OCVPR1 AN

—

PA0

OCP

Over current protection input

OCVPR1 AN

—

PA3

DAPWR

D/A Converter power input

OCVPR0 PWR —

PA1

AN0~AN7

A/D Converter input 0~7

ADCR0

ACERL

AN

—

PA0~PA7

VREF

A/D Converter reference voltage input ADCR1 AN

—

PA1

INT0, INT1

External interrupt 0, 1

INTEG

INTC0 ST

—

INTC2

PA5, PA6

TCK0, TCK1

TM0, TM1 input

—

ST

—

PA5, PA6

TP0_0, TP0_1

TM0 I/O

TMPC ST CMOS

PA7, PB0

TP1_0, TP1_1

TM1 I/O

TMPC ST CMOS

PB3, PB1

ICPCK

In-circuit programming clock pin

—

ST

—

PA7

ICPDA

In-circuit programming data/address pin

—

ST CMOS

PA6

OCDSCK

On-chip debug support clock pin

—

ST

—

PA7

OCDSDA

On-chip debug support data/address pin

—

ST CMOS

PA6

OUTL, OUTH

Complementary PWM output

TMPC

— CMOS

PB5, PB4

VDD

Positive power supply

—

PWR —

—

VSS

Negative power supply, ground

—

PWR —

—

Note: I/T: Input type;

O/T: Output type

OPT: Optional by configuration option (CO) or register option

PWR: Power;

ST: Schmitt Trigger input

CMOS: CMOS output;

AN: Analog signal

Rev. 1.10

9

January 15, 2013

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