HT47C20 datasheet(5/56 Pages) HOLTEK

5 / 56 page

Pad Description

Pad No.

Pad Name

I/O

Mask

Option

Function

RES

Schmitt trigger reset input. Active low.

6~9

PA0/BZ

PA1/BZ

PA2/IR

PA3/PFD

PA4~PA7

I/O

Wake-up

Pull-high

or None

CMOS or

NMOS

Bidirectional 8-bit input/output port. The low nibble

of the PA can be configured as CMOS output or

NMOS output with or without pull-high resistors

(mask option). NMOS output can be configured as

schmitt trigger input with or without pull-high resis-

tors. Each bit of NMOS output can be configured as

wake up input by mask option. Of the eight bits,

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

mask option. PA2 can be set as an I/O pin or an IR

carrier output also by mask option. PA3 can be set as

an I/O pin or a PFD output also by mask option.

PB0/INT

PB1

PB2/TMR

PB3

Four-bit Schmitt trigger input port. The PB is config-

ured as with pull-high resistors. Of the four bits, PB0

can be set as an input pin or an external interrupt in-

put pin (INT) by software application. While PB2 can

be set as an input pin or a timer/event counter input

pin also by software application.

VSS

¾¾

Negative power supply, GND

IN1

CS1

RS1

RT1

Oscillation input pin of channel 1

Reference capacitor connection pin of channel 1

Reference resistor connection pin of channel 1

Resistor sensor connection pin for measurement of

channel 1

IN0

CS0

RS0

CRT0

RT0

Oscillation input pin of channel 0

Reference capacitor connection pin of channel 0

Reference resistor connection pin of channel 0

Resistor/capacitor sensor connection pin for mea-

surement of channel 0

Resistor sensor connection pin for measurement of

channel 0

26~24

SEG19/COM3

COM2~COM0

1/3 or 1/4

Duty

SEG19/COM3 can be set as a segment or a common

output driver for LCD panel by mask option.

COM2~COM0 are outputs for LCD panel plate.

28~46

SEG18~SEG0

LCD driver outputs for LCD panel segments

49, 48, 47

51, 50

V1, V2, V3

C1, C2

¾¾

Voltage pump

OSC4

OSC3

Real time clock oscillators

HT47C20

January 18, 2000

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