HT49CA1 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT49CA1' PDF : 58 Pages View PDF
HT49RA1/HT49CA1
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
¾
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
8-bit Schmitt trigger input lines with pull-high resistors. Each bit can be con-
I
Wake-up 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 Bidirectional I/O port. PC0 can be configured as a CMOS output pin or car-
Pull-high 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
¾
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
I
¾
A resistor is connected between OSC1 and ground to implement the internal
system clock.
OSC3
I
OSC4
O
VLCD
¾
V1, V2, C1, C2
Real time clock oscillator. OSC3 and OSC4 are connected to a 32768Hz
¾
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.
¾
LCD power supply. VLCD should be larger than VDD for connect operation
i.e. VLCD ³ VDD
LCD voltage pump
COM0~COM2
COM3/SEG32
O
1/2, 1/3 or 1/4
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 O
¾
LCD panel segments driver outputs.
SEG12~SEG19
O
SEG12~SEG19 LCD panel segments driver outputs . SEG12~SEG19 can be setup as LCD
CMOS Output segment outputs or as CMOS output via a configuration option.
SEG20~SEG31 O
¾
LCD panel segments driver outputs.
RES
I
¾
Schmitt Trigger reset input. Active low.
VDD
¾
¾
Positive power supply
VSS
¾
¾
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
Input Voltage..............................VSS-0.3V to VDD+0.3V
IOL Total ..............................................................150mA
Total Power Dissipation .....................................500mW
Storage Temperature ............................-50°C to 125°C
Operating Temperature...........................-40°C to 85°C
IOH Total............................................................-100mA
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.
Rev. 1.10
3
March 30, 2014
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