HT49RA1 datasheet(4/58 Pages) HOLTEK

4 / 58 page

Pin Description

Pin Name

I/O

Configuration

Option

Description

PA0~PA7

I/O

Bidirectional NMOS 8-bit input/output port. Each bit can be chosen as an

NMOS output or Schmitt trigger input using software instructions. Pull-high

resistors are permanently connected to these pins.

PB0/INT0

PB1/INT1

PB2/TMR0

PB3/TMR1

PB4~PB7

Wake-up

8-bit Schmitt trigger input lines with pull-high resistors. Each bit can be con-

figured as a wake-up input via configuration options. Pins PB0, PB1, PB2

and PB3 are pin-shared with INT0, INT1, TMR0 and TMR1 respectively

PC0/REM

I/O

Carrier Output

Pull-high

Bidirectional I/O port. PC0 can be configured as a CMOS output pin or car-

rier output pin using a configuration option.

PD0/SEG0~

PD3/SEG3

I/O

Bidirectional NMOS 4-bit input/output port. Each bit can be chosen as an

NMOS output or Schmitt trigger input using software instructions. Each pin

on this port can be configured either as a segment pin or normal I/O pin us-

ing the LCDC register. When used as I/O pins pull-high resistors are perma-

nently connected to these pins.

OSC1

A resistor is connected between OSC1 and ground to implement the internal

system clock.

OSC3

OSC4

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

crystal oscillator for timing purpose. It is not used as the system clock. If the

RTC is not selected as fS. then OSC3, OSC4 should be left floating.

VLCD

¾¾

LCD power supply. VLCD should be larger than VDD for connect operation

i.e. VLCD

³ VDD

V1, V2, C1, C2

LCD voltage pump

COM0~COM2

COM3/SEG32

1/2, 1/3or1/4

Duty

COM0~COM2 are the LCD panel common connections. Pin COM3/SEG32

can be setup as an LCD panel segment or as a common output driver via

configuration options.

SEG4~SEG11

LCD panel segments driver outputs.

SEG12~SEG19

CMOS Output

LCD panel segments driver outputs . SEG12~SEG19 can be setup as LCD

segment outputs or as CMOS output via a configuration option.

SEG20~SEG31

LCD panel segments driver outputs.

RES

Schmitt Trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Note:

Each pin on PB can be programmed through a configuration option to have a wake-up function.

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

IOL Total ..............................................................150mA

IOH Total............................................................

-100mA

Total Power Dissipation .....................................500mW

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 reliability.

HT49RA1/HT49CA1

Rev. 1.00

May 7, 2008

HT49RA1 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

HT49RA1 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

Datasheet Download

Link URL