Pin Description

With the exception of the power 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, Serial Port pins, etc. The function of each pin is listed in the following tables, how-

ever the details behind how each pin is configured is contained in individual MCU and SPI to USB chip datasheet. The

important point to note here is that some I/O lines are not bonded to the external pins. Users should take special care of

these I/O port lines. Refer to the Hardware Considerations section for more details.

HT66FB30

Pin Name

Function

OP

I/T

O/T

Pin-Shared Mapping

PA0~PA7

Port A

PAWU

PAPU

ST

CMOS

¾

PB0~PB5

Port B

PBPU

ST

CMOS

¾

PC2~PC3

Port C

PCPU

ST

CMOS

¾

AN0~AN7

A/D converter input

ACERL

AN

¾

PA0~PA7

VREF

A/D converter reference input

ADCR1

AN

¾

PB5

C0-, C1-

Comparator 0, 1 input

CP0C

CP1C

AN

¾

PA3, PC3

C0+, C1+

Comparator 0, 1 input

AN

¾

PA2, PC2

C0X, C1X

Comparator 0, 1 output

¾

CMOS

PA0, PA5

TCK0, TCK1 TM0, TM1 input

¾

ST

¾

PA2, PA4

TP0_0

TM0 I/O

TMPC0

ST

CMOS

PA0

TP1A

TM1 I/O

TMPC0

ST

CMOS

PA1

INT0, INT1

External interrupt 0, 1

¾

ST

¾

PA3, PA4

PINT

Peripheral Interrupt ***

PRM0

ST

¾

PC3 or PC4

PCK

Peripheral Clock Output ***

PRM0

¾

CMOS

PC2 or PC5

SDI

SPI data input ***

PRM0

ST

¾

PA6 or PC0

SDO

SPI data output ***

PRM0

¾

CMOS

PA5 or PC1

SCS

SPI slave select ***

PRM0

ST

CMOS

PB5 or PC6

SCK

SPI serial clock ***

PRM0

ST

CMOS

PA7 or PC7

SCL

I

2

C clock

PRM0

ST

NMOS

PA7

SDA

I

2

C data

PRM0

ST

NMOS

PA6

OSC1

HXT/ERC pin

CO

HXT

¾

PB1

OSC2

HXT pin

CO

¾

HXT

PB2

XT1

LXT pin

CO

LXT

¾

PB3

XT2

LXT pin

CO

¾

LXT

PB4

RES

Reset input

CO

ST

¾

PB0

VDD

MCU power supply *

¾

PWR

¾¾

AVDD

A/D converter power supply *

¾

PWR

¾¾

VSS

MCU ground **

¾

PWR

¾¾

AVSS

A/D converter ground **

¾

PWR

¾¾

UDP

USB D+ pin

¾

ST

CMOS

¾

UDN

USB D- pin

¾

ST

CMOS

¾

HT66FB30/HT66FB40/HT66FB50/HT66FB60

Rev. 1.10

6

June 4, 2010