HT46R24/HT46C24
Pin Description
Pin Name
I/O
Options
Description
PA0~PA2
PA3/PFD
PA4
Bidirectional 8-bit input/output port. Each bit can be configured as wake-up
input by option (bit option). Software instructions determine the CMOS out-
put or Schmitt trigger input with or without pull-high resistor (determined by
pull-high options: bit option). The PFD and INT are pin-shared with PA3
and PA5, respectively. Once the I2C Bus function is used, the internal reg-
isters related to PA6 and PA7 cannot be used.
Pull-high
Wake-up
I/O PA3 or PFD
I/O or Serial
Bus
PA5/INT
PA6/SDA
PA7/SCL
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4/AN4
PB5/AN5
PB6/AN6
PB7/AN7
Bidirectional 8-bits 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 se-
lected as an A/D input (by using software control), the I/O function and
pull-high resistor are automatically disabled.
I/O
Pull-high
PC0~PC4
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without pull-high resistor (deter-
mine by pull-high option: byte option).
(28-pin package only)
I/O
Pull-high
PC0~PC7
(48-pin package only)
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without a pull-high resistor.
The PWM0 output function is pin-shared with PD0.
PD0/PWM0
Pull-high
PWM
PD1/PWM1/TMR1 I/O
(28-pin package only)
The PWM1 output function is pin-shared with PD1 and TMR1.
(determined by pull-high option: byte option)
PD0/PWM0
PD1/PWM1
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without a pull-high resistor (de-
termined by pull-high option: byte option). The PWM0/PWM1/PWM2/
PWM3 output function are pin-shared with PD0/PD1/PD2/PD3 (depending
on the PWM options).
PD2/PWM2
I/O
Pull-high
PWM
PD3/PWM3
PD4~PD7
(48-pin package only)
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without pull-high resistor (deter-
mine by pull-high option: byte option).
PF0~PF7
I/O
Pull-high
(48-pin package only)
TMR0
I
I
Timer/Event Counter 0 Schmitt trigger input (without pull-high resistor)
Timer/Event Counter 1 Schmitt trigger input (without pull-high resistor).
¾
¾
TMR1
(48-pin package only)
RES
VSS
VDD
I
Schmitt trigger reset input, active low
Negative power supply, ground
Positive power supply
¾
¾
¾
¾
¾
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 terminal for 1/4 system clock.
OSC1
OSC2
I
Crystal
or RC
O
TEST1~3
NC
I
Test mode input pin it disconnects in normal operation.
No connection
¾
¾
¾
Rev. 2.01
3
January 21, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
