HT46C232 datasheet(3/50 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 regis-

ters 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~PC7

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).

PD0/PWM0

PD1/PWM1

PD2/PWM2

PD3/PWM3

PD4~PD7

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

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

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.

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

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 reliabil-

ity.

HT46R232/HT46C232

Rev. 1.40

November 23, 2005

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