HT46C24 datasheet(3/51 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Options

Description

PA0~PA2

PA3/PFD

PA4

PA5/INT

PA6/SDA

PA7/SCL

I/O

Pull-high

Wake-up

PA3 or PFD

I/O or Serial

Bus

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

input by option (bit option). Software instructions determine the CMOS out-

put or Schmitt trigger input with or without pull-high resistor (determined by

pull-high options: bit option). The PFD and INT are pin-shared with PA3

and PA5, respectively. Once the I

2C Bus function is used, the internal reg-

isters related to PA6 and PA7 cannot be used.

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

PB4/AN4

PB5/AN5

PB6/AN6

PB7/AN7

I/O

Pull-high

Bidirectional 8-bits input/output port. Software instructions determine the

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mined by pull-high option: bit option) or A/D input. Once a PB line is se-

lected as an A/D input (by using software control), the I/O function and

pull-high resistor are automatically disabled.

PC0~PC4

(28-pin package only)

I/O

Pull-high

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

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mine by pull-high option: byte option).

PC0~PC7

(48-pin package only)

PD0/PWM0

PD1/PWM1/TMR1

(28-pin package only)

I/O

Pull-high

PWM

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

CMOS output, Schmitt trigger input with or without a pull-high resistor.

The PWM0 output function is pin-shared with PD0.

The PWM1 output function is pin-shared with PD1 and TMR1.

(determined by pull-high option: byte option)

PD0/PWM0

PD1/PWM1

PD2/PWM2

PD3/PWM3

PD4~PD7

(48-pin package only)

I/O

Pull-high

PWM

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

CMOS output, Schmitt trigger input with or without a pull-high resistor (de-

termined by pull-high option: byte option). The PWM0/PWM1/PWM2/

PWM3 output function are pin-shared with PD0/PD1/PD2/PD3 (depending

on the PWM options).

PF0~PF7

(48-pin package only)

I/O

Pull-high

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

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mine by pull-high option: byte option).

TMR0

Timer/Event Counter 0 Schmitt trigger input (without pull-high resistor)

TMR1

(48-pin package only)

Timer/Event Counter 1 Schmitt trigger input (without pull-high resistor).

RES

Schmitt trigger reset input, active low

VSS

¾¾

Negative power supply, ground

VDD

¾¾

Positive power supply

OSC1

OSC2

Crystal

or RC

OSC1 and OSC2 are connected to an RC network or a crystal (by options)

for the internal system clock. In the case of RC operation, OSC2 is the

output terminal for 1/4 system clock.

TEST1~3

Test mode input pin it disconnects in normal operation.

¾¾

No connection

HT46R24/HT46C24

Rev. 2.00

March 2, 2006

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