3 - 4
Name
No.
I/O
Other
Function
Function
D escription
TXD
25
Output
SBO0, P00
UART transmission
data output pin
In the seri al i nterface i n UART mode, thi s pi n i s
configured as the transmission data output pin.
The output configuration, either CMOS push-pull or n-
channel open-drain can be selected. Pull-up resistors
can be selected by the P0PLU resister.
Select output mode by the P0DIR register, and serial
data output by serial 0 mode register 3 ( SC0MD3 ).
This can be used as normal I/O pin when the serial
interface is not used.
RXD
26
Input
SBI0, P01
UART reception data
input pin
In the seri al i nterface i n UART mode, thi s pi s i s
configured as the received data input pin.
Pull-up resi stors can be selected by the P0PLU
register. Set this pin to the input mode by the P0DIR
register, and to the serial input mode by the serial 0
mode register 3 ( SC0MD3).
This can be used as normal I/O pin when the serial
interface is not used.
TM2IO
TM3IO
35
36
I/O
P12
P13
Timer I/O pins
Event counter clock input pins, timer output and PWM
signal output pins for 8-bit timers 2 to 3.
To use these pins as event clock inputs, configure them
as inputs by the P1DIR register. When the pins are
used as inputs, pull-up resistors can be specified by the
P1PLU register.
For timer output, PWM signal output, select the special
functi o n p i n b y the p o rt 1 o utp ut mo d e re g i ste r
(P1OMD) and set to the output mode by the P1DIR
register.
When not used for timer I/O, these can be used as
normal I/O pins.
RMOUT
33
I/O
P10
Remote control
transmission signal
output pin
Output pin for remote control transmission signal with
a carrier signal.
For remote control carrier output, select the special
functi o n p i n b y the p o rt 1 o utp ut mo d e re g i ste r
(P1OMD) and set to the output mode by the P1DIR
register. Also, set to the remote control carrier output
by the remote control carrier output control register
(RMCTR).
This can be used as a normal I/O pin when remote
control is not used.
BUZZER
31
Output
P06, NDK
Buzzer output
Piezoelectric buzzer driver pin. The driving frequency
can be selected by the DLYCTR register.
Select output mode by the P0DIR register and select
P06 buzzer output by the DLYCTR register.
When not used for buzzer output, this pin can be used
as a normal I/O pin.
PIN DESCRIPTIONS OF IC
MCU MN101C39C_399
