HT46R4A datasheet(3/60 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Configuration

Option

Description

PA0~PA2

PA3/PFD

PA4/TMR0

PA5/INT

PA6

PA7/TMR1

I/O

Pull-high

Wake-up

PA3 or PFD

Bidirectional 8-bit input/output port. Each individual pin on this port can be config-

ured as a wake-up input by a configuration option. Software instructions deter-

mine if the pin is a CMOS output or Schmitt Trigger input. Configuration options

determine which pins on the port have pull-high resistors. Pins PA3, PA4, PA7

and PA5 are pin-shared with PFD, TMR0, TMR1 and INT, respectively.

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

PB4/AN4

PB5/AN5

PB6~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. Configuration options determine which

pins on the port have pull-high resistors. PB is pin-shared with the A/D input pins.

The A/D inputs are selected via software instructions. Once selected as an A/D in-

put, the I/O function and pull-high resistor options are disabled automatically.

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. Configuration options determine which

pins on the port have pull-high resistors.

PD0/PWM0

PD1/PWM1

PD2

I/O

Pull-high

I/O or PWM

Bidirectional 3-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt Trigger input. Configuration option determines which

pins on the port have pull-high resistors. The PWM outputs are pin-shared with

pins PD0 and PD1 selected via configuration options.

OSC1

OSC2

Crystal or RC

OSC1, OSC2 are connected to an external RC network or external crystal, deter-

mined by configuration option, for the internal system clock. If the RC system

clock option is selected, pin OSC2 can be used to measure the system clock at

1/4 frequency.

RES

Schmitt Trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Note:

1. Each pin on PA can be programmed through a configuration option to have a wake-up function.

2. Individual pins can be selected to have a pull-high resistor.

3. Pins PC5~PC7 and pin PD2 exist but are not bounded out on the 28-pin package.

4. Unbounded pins should be setup as outputs or as inputs with pull-high resistors to conserve power.

Absolute Maximum Ratings

Supply Voltage ...........................VSS

-0.3V to VSS+6.0V

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

-50°Cto125°C

Input Voltage..............................VSS

-0.3V to VDD+0.3V

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

-40°Cto85°C

IOL Total ..............................................................150mA

IOH Total............................................................

-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.

HT46R4A

Rev. 1.00

November 28, 2007

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