HT45FM03B datasheet(3/83 Pages) HOLTEK

3 / 83 page

Pad Description

Pad Name

I/O

Option

Description

PA0/OPVINP

PA1/CVINP

PA2/CVINN

PA3/COUT

PA4/INT0A

PA5/INT0B

PA6/INT0C

PA7/INT1

I/O

Pull-high

Wake-up

INT0A

INT0B

INT0C

Bidirectional 8-bit input/output port. Each pin can be configured as

wake-up input by configuration option. Software instructions determine

if the pin is a CMOS output or Schmitt Trigger input. Configuration op-

tions determine if the pins have pull-high resistors. Pins PA4~PA6 are

pin-shared with INT0A, INT0B and INT0C, the function being selected

via configuration options. PA7 is pin-shared with the external interrupt

pin INT1. PA1, PA2 and PA3 are pin-shared with comparator pins

CVINP, CVINN and COUT. PA0 is shared with OPVINP.

PB0/AN0

PB1/AN1

PB2/AN2/OPOUT

PB3/AN3/OPVINN

PB4/AN4/INT0A

PB5/AN5/INT0B

PB6/AN6/INT0C

PB7/AN7/TMR0/TMR1

I/O

Pull-high

INT0A

INT0B

INT0C

Bidirectional 8-bit input/output port. Software instructions determine if

the pin is a CMOS output or Schmitt Trigger input. Configuration op-

tions determine if the pins have pull-high resistors. PB is pin-shared

with the A/D inputs. Pins PB4~PB6 are also pin-shared with INT0A,

INT0B and INT0C, the function being selected via configuration op-

tions. Pins PB2 and PB3 are also pin pin-shared with operational am-

plifier pins OPOUT and OPVINN. Pin PB7 is also pin-shared with timer

input pins TMR0 and TMR1.

PC0/PWM0H

PC1/PWM0L

PC2/PWM1H

PC3/PWM1L

PC4/PWM2H

PC5/PWM2L

I/O

Pull-high

Bidirectional 6-bit input/output port. Software instructions determine if

the pin is a CMOS output or Schmitt Trigger input. Configuration op-

tions determine if the pins have pull-high resistors. PC is pin shared

with the Pulse Width Modulation complimentary output pairs,

PWM0H~PWM2H and PWM0L~PWM2L.

PD0/PFD

I/O

Pull-high

PFD

Bidirectional 1-line I/O. Software instructions determine if the pin is a

CMOS output or Schmitt Trigger input. A configuration option deter-

mines if pin PD0 has a pull-high resistor. Pin PD0 is shared with the

PFD output.

PD1/RES

I/O

PD1 or

RES

Bidirectional 1-bit input/output port. Software instructions determine if

the pin is a CMOS output or Schmitt Trigger input. Pin PD1 does not

have a pull-high option. Pin PD1 is pin-shared with the reset input pin

RES. RES is a Schmitt Trigger reset input. Active low.

PD2/OSC1

PD3/OSC2

I/O

1.Int. RC

OSC

2.Crystal

OSC

3.Ext. RC

OSC

Bidirectional 2-line I/O. Software instructions determine if the pins are

CMOS outputs or Schmitt Trigger inputs. Pin PD2~PD3 do not have

pull-high options. Configuration options determine if the pins are to be

used as oscillator pins or I/O pins. Configuration options also deter-

mine which oscillator mode is selected. The three oscillator modes are:

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

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

3. External RC OSC+PD3: PD2 is configured as OSC1 pin, PD3 con-

figured as an I/O.

If the internal RC OSC is selected, the frequency will be fixed at either

12MHz, 16MHz or 20MHz, dependent upon which configuration option

is chosen.

VSS

¾¾

Negative power supply, ground

AVSS

¾¾

Ground connection for A/D converter. The VSS and AVSS are the

same pin at 28 pin package.

VDD

¾¾

Positive power supply

AVDD

¾¾

Power supply connection for A/D converter. The VDD and AVDD are

the same pin at 28 pin package.

HT45FM03B

Rev. 1.00

December 16, 2009

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