HT46R49
Pin Name I/O Configuration
Option
Description
PA0~PA2
PA3/PFD
PA4/TMR
PA5/INT
PA6~PA7
I/O
Pull-high
Wake-up
PA3 or PFD
Bidirectional 8-bit input/output port. Each individual pin on this port can be config-
ured as a wake-up input by a configuration option. Software instructions deter-
mine if the pin is a CMOS output or Schmitt Trigger input. Configuration options
determine which pins on the port have pull-high resistors. Pins PA3, PA4 and PA5
are pin-shared with PFD, TMR and INT, respectively.
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4~PB7
I/O
Pull-high
Bidirectional 8-bit input/output port. Software instructions determine if the pin is a
CMOS output or Schmitt Trigger input. Configuration options determine which
pins on the port have pull-high resistors. PB is pin-shared with the A/D input pins.
The A/D inputs are selected via software instructions. Once selected as an A/D in-
put, the I/O function and pull-high resistor options are disabled automatically.
PC0~PC4
I/O
Pull-high
Bidirectional 5-bit input/output port. Software instructions determine if the pin is a
CMOS output or Schmitt Trigger input. Configuration options determine which
pins on the port have pull-high resistors.
PD0/PWM0
PD1/PWM1
I/O
Pull-high
I/O or PWM
Bidirectional 2-bit input/output port. Software instructions determine if the pin is a
CMOS output or Schmitt Trigger input. Configuration option determines if this pin
has a pull-high resistor. The PWM output are pin-shared with pins PD0 and PD1
selected via a configuration option.
OSC1
OSC2
I
O
Crystal or RC
OSC1, OSC2 are connected to an external RC network or external crystal, deter-
mined by configuration option, for the internal system clock. If the RC system
clock option is selected, pin OSC2 can be used to measure the system clock at
1/4 frequency.
RES
I
¾
Schmitt Trigger reset input. Active low.
VDD
¾
¾
Positive power supply
VSS
¾
¾
Negative power supply, ground
Note:
1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins can be selected to have a pull-high resistor.
3. Pins PC1~PC4 exist but are not bonded out on the 20-pin and 24-pin package.
Pins PB4~PB7 exist but are not bonded out on the 20-pin package.
4. Unbonded pins should be setup as outputs or as inputs with pull-high resistors to conserve power.
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
-
0.3V to V
SS
+6.0V
Storage Temperature ............................
-
50
°
C to 125
°
C
Input Voltage..............................V
SS
-
0.3V to V
DD
+0.3V
Operating Temperature...........................
-
40
°
C to 85
°
C
I
OL
Total ..............................................................150mA
I
OH
Total............................................................
-
100mA
Total Power Dissipation .....................................500mW
Note: These are stress ratings only. Stresses exceeding the range specified under
²
Absolute Maximum Ratings
²
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.
HT46R46/C46/R47/C47/R48A/C48A/R49
Rev. 1.41
5
December 30, 2008
