HT49C10 datasheet(5/47 Pages) HOLTEK

5 / 47 page

Pad Description

Pad No.

Pad Name

I/O

Mask

Option

Description

1~4

PA0/BZ

PA1/BZ

PA2

PA3/PFD

PA4~PA7

I/O

Wake-up

Pull-high

or None

CMOS or

NMOS

PA0~PA7 constitute an 8-bit bidirectional input/ out-

put port with Schmitt trigger input capability. Each

bit on port can be configured as wake-up input by

mask option. PA0~PA3 can be configured as CMOS

(output) or NMOS (input/output) and with or without

pull-high resistor by mask option, PA4~PA7 always

pull-high and NMOS (input/output). Of the eight bits,

PA0~PA1 can be set as I/O pins or buzzer outputs by

mask option. PA3 can be set as an I/O pin or a PFD

output also by mask option.

8~10

PB0/INT0

PB1/INT1

PB2/TMR

PB3~PB5

PB0~PB5 constitute a 6-bit Schmitt trigger input

port. Each bit on port are pull-high resistor. Of the six

bits, PB0 can be set as input pin or external interrupt

control pin (INT0) by software application. PB1 can be

set as input pin or an external interrupt control pin

(INT1) by software application. While PB2 can be set

as input pin or timer/event counter input pin also by

software application.

VSS

Negative power supply, GND

VLCD

LCD power supply

13~16

V1,V2,C1,C2

Voltage pump

19~17

SEG18/COM3

COM2~COM0 O

1/3 or 1/4

Duty

SEG18 can be set as segment or common output driver

for LCD panel by mask option. COM2~COM0 are out-

puts for LCD panel plate.

21~38

SEG17~SEG0 O

LCD driver outputs for LCD panel segments

OSC4

OSC3

Real time clock oscillators

VDD

¾¾

Positive power supply

OSC2

OSC1

Crystal or

OSC1 and OSC2 are connected to an RC network or a

crystal (by mask option) for the internal system clock.

In the case of RC operation, OSC2 is the output termi-

nal for 1/4 system clock.

RES

Schmitt trigger reset input, active low

HT49C10

September 28, 1999

HT49C10 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

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