HT46R12A
Pin Description
Pin Name
I/O
Options
Description
PA0~PA2
PA3/PFD
PA4/TMR0
PA5, PA6
PA7/TMR1
Bidirectional 8-bit input/output port. Each pin can be configured as a wake-up
input by configuration option. Software instructions determine if the pin is a
CMOS output or Schmitt trigger input. Configuration options determine which pins
Pull-high
Wake-up
I/O
PA3 or PFD on the port have pull-high resistors. Pins PA3, PA4 and PA7 are pin-shared with
PFD, TMR0 and TMR1 respectively.
Bidirectional 4-bit input/output port. Software instructions determine if the pin is
a CMOS output or Schmitt trigger input. Configuration options determine which
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
I/O
Pull-high
pins on the port have pull-high resistors. PB is shared with the A/D input pins. The
A/D inputs are selected via software instructions. Once selected as an A/D input,
the I/O function and pull-high resistor functions are disabled automatically.
Bi-directional 5-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input. A configuration option determines if all
pins on the the port have pull-high resistors. C0VIN-, C0VIN+ and C0OUT are
pin-shared with PC0, PC1 and PC2. Once the comparator 0 is enabled, the inter-
nal PC2 port control register can be used as input only, the PC2 output function
and the PC0/PC1/PC2 pull-high resistors will be disabled automatically, however
PC0 and PC1 maintain their I/O function. Software instructions determine if the
Comparator 0 function is enabled or not.
PC0/C0VIN-
PC1/C0VIN+
PC2/C0OUT
PC3/C1OUT
PC4/C1VIN-
C1VIN+
Pull-high
I/O or
I/O
C1VIN+ and C1VIN- are the Comparator 1 inputs, C1OUT and C1VIN- are
Comparator pin-shared with PC3 and PC4. Once the Comparator 1 function is enabled, the in-
ternal PC3 port control register can be used as input only, the PC3 output function
and the PC3/PC4 pull-high resistors will be disabled automatically, however PC4
maintains its I/O function. Software instructions determine if the Comparator 1
function is enabled or not.
The PC1/C0VIN+ pin is also the external interrupt input pin. A falling edge on this
pin will form an interrupt trigger source whether the pin is setup as a Comparator
input or I/O pin.
Programmable pulse generator output pin, the pin is floating when the power is
PPG
O
first applied. The PPG0 output level can be selected to be either active low or
active high, selected via configuration option.
¾
OSC1, OSC2 are connected to an RC network or a Crystal (determined by op-
tion) for the internal system clock. If the RC system clock option is selected, pin
OSC2 can be used to monitor the system clock at 1/4 frequency.
OSC1
OSC2
I
Crystal
or RC
O
RES
VDD
VSS
I
Schmitt trigger reset input. Active low.
Positive power supply
¾
¾
¾
¾
¾
Negative power supply, ground.
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
IOH Total............................................................-100mA
I
OL Total ..............................................................150mA
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.
Rev. 1.01
3
December 29, 2008
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
