HT46R65/HT46C65
Pin Description
Pin Name
I/O
Options
Description
PA0/BZ
Bidirectional 8-bit input/output port. Each bit can be configured as wake-up in-
put by ROM code option. Software instructions determine the CMOS output
or Schmitt trigger input with or without pull-high resistor (determined by
pull-high options: bit option). The BZ, BZ and PFD are pin-shared with PA0,
PA1 and PA3, respectively.
Wake-up
Pull-high
Buzzer
PFD
PA1/BZ
PA2
I/O
PA3/PFD
PA4~PA7
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4/AN4
PB5/AN5
PB6/AN6
PB7/AN7
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.
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 PWM0/PWM1/PWM2/PWM3 out-
put function are pin-shared with PD0/PD1/PD2/PD3 (dependent on PWM
options).
PD0/PWM0
PD1/PWM1
PD2/PWM2
PD3/PWM3
Pull-high
PWM
I/O
I/O
PD4/INT0
PD5/INT1
PD6/TMR0
PD7/TMR1
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.
Pull-high
VSS
Negative power supply, ground
LCD power supply
¾
¾
¾
¾
¾
VLCD
I
I
I
VMAX
IC maximum voltage connect to VDD, VLCD or V1
Voltage pump
V1, V2, C1, C2
COM0~COM2
COM3/SEG40
SEG40 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.
O
O
1/3 or 1/4 Duty
Logical Output
LCD driver outputs for LCD panel segments. SEG0~SEG23 can be optioned
as logical outputs.
SEG0~SEG39
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.
OSC1
OSC2
I
Crystal or RC
O
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
OSC3
OSC4
I
RTC or
O
System Clock
VDD
RES
Positive power supply
¾
¾
¾
I
Schmitt trigger reset input, active low
Absolute Maximum Ratings
Supply Voltage...........................VSS-0.3V to VSS+6.0V
Input Voltage..............................VSS-0.3V to VDD+0.3V
Storage Temperature............................-50°C to 125°C
Operating Temperature...........................-40°C to 85°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.
Rev. 2.00
4
April 13, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
