Pin Description

Pin Name

I/O

Options

Description

PA0/INT0

PA1/INT1

PA2/TMR

PA3~PA7

I/O

Pull-high*

Wake-up

Bidirectional 8-bit I/O port. Each pin can be configured as a wake-up input via con-

figuration options. Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. Pull-high resistors can be added to the whole port via a con-

figuration option.

Pins PA0 and PA1 are pin-shared with external interrupt input pins INT0 and INT1,

respectively. Configuration options determine the interrupt enable/disable and the

interrupt low/high trigger type. Pins PA2 is pin-shared with the external timer input

pins TMR.

PB0~PB7

I/O

Pull-high

Bidirectional 8-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt trigger input. Pull-high resistors can be added to the

whole port via a configuration option.

PC0~PC7

I/O

Pull-high

Bidirectional 8-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt trigger input. Pull-high resistors can be added to the

whole port via a configuration option.

PD0

I/O

Pull-high

Bidirectional 1-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt trigger input. A pull-high resistor can be added via a con-

figuration option.

RC1~RC16

I

¾

Capacitor or resistor connection pins

RCOUT

I

¾

Capacitor or resistor connection pin to RC OSC

IN

I

¾

Oscillation input pin

RREF

O

¾

Reference resistor connection pin

CREF

O

¾

Reference capacitor connection pin

RES

I

¾

Schmitt trigger reset input. Active low

VSS

¾¾

Negative power supply, ground

VSSC

¾¾

Negative power supply for PC, ground

VDD

¾¾

Positive power supply

VDDB

¾¾

Positive power supply PB

OSC1

OSC2

I

O

Crystal or RC

OSC1, OSC2 are connected to an RC network or Crystal determined by a configu-

ration option, for the internal system clock. In the case of the RC oscillator, OSC2

can be used to monitor the system clock. Its frequency is 1/4 system clock.

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

Absolute Maximum Ratings

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

-50°Cto125°C

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

-40°Cto85°C

-200mA

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.

HT45R36

Rev. 1.00

3

September 28, 2006