HT46C64 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~PA7

I/O

Wake-up

Pull-high

Buzzer

PFD

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

put by option. Software instructions determine the CMOS output or Schmitt

Trigger input with or without pull-high resistor (determined by pull-high op-

tions: bit option). The BZ, BZ and PFD are pin-shared with PA0, PA1 and

PA3, respectively.

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

PB4/AN4

PB5/AN5

PB6/AN6

PB7/AN7

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-

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

as an A/D input (by using software control), the I/O function and pull-high re-

sistor are disabled automatically.

PD0/PWM0

PD1/PWM1

PD2/PWM2

PD3/PWM3

I/O

Pull-high

PWM

Bidirectional 4-bit input/output port. Software instructions determine the

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

mined by pull-high option: bit option). The PWM0/PWM1/PWM2/PWM3 out-

put function are pin-shared with PD0/PD1/PD2/PD3 (dependent on PWM

options).

PD4/INT0

PD5/INT1

PD6/TMR0

PD7/TMR1

I/O

Pull-high

Bidirectional 4-bit input/output port. Software instructions determine the

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

mined by pull-high option: bit option). The INT0, INT1, TMR0 and TMR1 are

pin-shared with PD4/PD5/PD6/PD7.

VSS

¾¾

Negative power supply, ground

VLCD

LCD power supply

VMAX

IC maximum voltage connect to VDD, VLCD or V1

V1, V2, C1, C2

Voltage pump

COM0~COM2

COM3/SEG32

1/3or1/4 Duty

SEG32 can be set as a segment or as a common output driver for LCD panel

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

SEG0~SEG31

Logical Output

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

as logical outputs.

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 ter-

minal for 1/4 system clock. The system clock may come from the RTC oscilla-

tor. If the system clock comes from RTCOSC, these two pins can be floating.

OSC3

OSC4

RTC or

System Clock

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

crystal oscillator for timing purposes or to a system clock source (depending

on the options). No built-in capacitor

VDD

¾¾

Positive power supply

RES

Schmitt trigger reset input, active low

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.

HT46R64/HT46C64

Rev. 1.40

September 21, 2004

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