Chapter 1
Overview
I - 14
Pin Description
Table 1-3-5
Pin Function Summary (4/7)
Name
No.
I/O
Other
Function
Description
80LQFP
84QFP
SBI0
SBI2
29
32
31
34
Input
P01, RXD
P04
Serial interface
received data input
pins
Receive data output pins for serial interfaces 0 , 2.
Pull-up and pull-down resistors can be selected by the
P0PLUD register. Select input mode by the P0DIR
register, and serial input mode by the serial mode
register 1 ( SC0MD1, SC2MD1).
These can be used as normal I/O pins when the serial
interface is not used.
SBT0
SBT2
30
33
32
35
I/O
P02
P05
Serial interface clock
I/O pins
Clock I/O pins for serial interfaces 0 , 2.
The output configuration, either CMOS push-pull or n-
channel open-drain can be selected. Pull-up and pull-
down resi stors can be selected by the P0PLUD
register. Select clock I/O for each communication mode
by the P0DIR register and serial mode register 1
( SC0MD1, SC2MD1).
These can be used as normal I/O pins when the serial
interface is not used.
TXD
28
30
Output
SBO0, P00
UART transmission
data output pins
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 and pull-
down resi stors can be selected by the P0PLUD
resister.
Select output mode by the P0DIR register, and serial
data output by serial 0 mode register 1 ( SC0MD1).
This canbe used as normal I/O pinwhenthe serial
interface is not used.
RXD
29
31
Input
SBI0, P01
UART received data
input pin
In the seri al i nterface i n UART mode, thi s pi n i s
configured as the received data input pin.
Pull-up and pull-down resistors can be selected by the
P0PLUD register. Set this pin to the input mode by the
P0DIR register, and to the serial input mode by the
serial 0 mode register 1 ( SC0MD1).
This canbe used as normal I/O pinwhenthe serial
interface is not used.