Pin Description

Pin Name

I/O

Configura-

tion

Options

Description

PA0/BZ

PA1/BZ

I/O

¾

Bidirectional 2-line I/O. Each pin can be setup as a wake-up input using a soft-

ware register. Software instructions determine if each pin is a CMOS output or a

Schmitt trigger input. Pull-high resistors can be connected using a pull-high soft-

ware register. PA0/PA1 are pin-shared with the BZ and BZ buzzer function pins.

PA2/TMR0

I/O

¾

Bidirectional single line I/O. PA2 can be setup as a wake-up input using a soft-

ware register. Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. A pull-high resistor can be connected using a pull-high soft-

ware register. This line is pin-shared with the Timer/event 0 counter input.

PA3/INT

I/O

¾

Bidirectional single line I/O. PA3 can be setup as a wake-up input using a soft-

ware register. Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. A pull-high resistor can be connected using a pull-high soft-

ware register. This line is pin-shared with INT.

PA4/TMR1

I/O

¾

Bidirectional single line I/O. PA4 can be setup as a wake-up input using a soft-

ware register. Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. A pull-high resistor can be connected using a pull-high soft-

ware register. This line is pin-shared with the Timer/event counter 1 input.

OSC1/PA6

OSC2/PA5

I/O

RC, Crystal,

RTC or I/O

Bidirectional 2-line I/O and oscillator pins. If configured as I/Os, software instruc-

tions determine if each pin is a CMOS output or a Schmitt trigger input. Pull-high

resistors can be connected using a pull-high software register. A configuration

option determines the choice of oscillator mode and I/O function. The four oscilla-

tor modes are:

1. Internal RC OSC: both pins configured as I/Os

2. External crystal OSC: both pins configured as OSC1/OSC2

3. Internal RC + RTC OSC: both pins configured as OSC2, OSC1.

4. External RC OSC+PA5: PA6 configured as OSC1 pin, PA5 configured as I/O

Note: When the system clock is sourced from the internal RC OSC, there are 3

frequency options

® 12MHz, 8MHz and 4MHz.

PA7/RES

I

PA7 or RES Active low schmitt trigger reset input or PA7 input.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

* All pull-high resistors are controlled by an register option bit.

Absolute Maximum Ratings

Storage Temperature ............................

-50°Cto125°C

Operating Temperature...........................

-40°Cto85°C

-100mA

Total Power Dissipation .....................................500mW

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed

in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT48R01/HT48R02/HT48R03

Rev. 1.00

3

December 20, 2006