HT46R652 datasheet(4/47 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Options

Description

PA0/BZ

PA1/BZ

PA2

PA3/PFD

PA4/TMR0

PA5/INT0

PA6/INT1

PA7/TMR1

I/O

Wake-up

Pull-high

Buzzer

PFD

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

configured as a wake-up input by a configuration option. Software instruc-

tions determine if the pin is a CMOS output or Schmitt trigger input. Configu-

ration options determine which pins on the port have pull-high resistors. Pins

PA0, PA1 and PA3 are pin-shared with BZ, BZ and PFD respectively. Pins

PA5, PA6, PA4 and PA7 are pin-shared with INT0, INT1, TMR0 and TMR1

respectively.

PB0/AN0~

PB7/AN7

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 a PB

line is selected as an A/D input, the I/O function and pull-high resistor

functions are disabled automatically.

PC0/PWM0~

PC7/PWM7

I/O

Pull-high

PWM

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

is a CMOS output or Schmitt trigger input. Configuration options determine if

all pins on the port have pull-high resistors. A configuration option deter-

mines if all of the pins on this port are to be used as PWM outputs. Individual

pins cannot be selected to have a PWM function.

PD0/PWM8~

PD7/PWM15

I/O

Pull-high

PWM

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. A configuration option for

each pin on this port determines if each pin is to be used as a PWM output.

VLCD

LCD power supply

VMAX

IC maximum voltage connect to VDD, VLCD or V1

V1, V2, C1, C2

Voltage pump

COM0~COM2

COM3/SEG40

1/3or1/4 Duty

SEG40 can be set as a segment or as a common output driver for LCD panel

by options. COM0~COM2 are outputs for the LCD panel.

SEG0~SEG39

Logical Output

LCD driver outputs for the the LCD panel segments. SEG0~SEG23 can be

configured as logical outputs via a configuration option.

OSC1

OSC2

Crystal or RC

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

mined by a configuration option) for the internal system clock. If the RC sys-

tem clock is selected, OSC2 can be used to measure the system clock at 1/4

frequency. The system clock may also be sourced from the RTC oscillator, in

which case these two pins can be left floating.

OSC3

OSC4

RTC or

System Clock

Real time clock oscillator. OSC3 and OSC4 are connected to a 32768Hz

crystal oscillator for timing purposes or to form a system clock source, de-

pending on configuration options.

RES

Schmitt trigger reset input, active low

VDD

¾¾

Positive power supply

AVDD/VREF

Analog positive power supply and A/D converter reference input voltage.

PCVDD

¾¾

Port C positive power supply

PDVDD

¾¾

Port D positive power supply

VSS/AVSS

¾¾

Negative power supply and analog negative power supply, ground

PCVSS

¾¾

Port C negative power supply, ground

PDVSS

¾¾

Port D negative power supply, ground

Note:

Individual pins on PC cannot be selected as a PWM output, if the PWM configuration option is selected for this

port then all pins on PC will be setup as PWM outputs.

HT46R652

Rev. 1.00

December 19, 2006

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