Philips ACT-500 Service Manual page 14

PIN DESCRIPTIONS OF IC
MCU MN101C39C_399
Name No.
TXD 25 Output
RXD 26 Input
TM2IO 35 I/O
TM3IO 36
RMOUT 33 I/O
BUZZER 31 Output
Other
I/O
Function
SBO0, P00 UART transmission
data output pin
SBI0, P01 UART reception data
input pin
P12 Timer I/O pins
P13
P10 Remote control
transmission signal
output pin
P06, NDK Buzzer output
3 - 4
Function
In the serial interface in UART mode, this pin is
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.
In the serial interface in UART mode, this pis is
configured as the received data input pin.
Pull-up resistors 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.
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 on pi n by the port 1 output mode regi ster
(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.
Output pin for remote control transmission signal with
a carrier signal.
For remote control carrier output, select the special
functi on pi n by the port 1 output mode regi ster
(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.
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.
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