559
Chapter 16
Port Functions
Preliminary User’s Manual U15839EE1V0UM00
16.3.2 Port
2
Port 2 is an 8-bit input/output port in which input or output can be specified in 1-bit units. Each port bit
can be independently configured to port input, port output or peripheral function
Note 1
.
This register can be read or written in 1-bit and 8-bit units.
Figure 16-10:
Port 2 (P2)
Remark:
In Input Mode: When the P2 register is read, the pin levels at that time are read. Writing to
the P2 register writes the values to that register. This does not affect the
input pins.
In Output Mode:When the P2 register is read, the values of P2 are read. Writing to the P2
register writes the values to that register and those values are immediately
output.
Besides functioning as a port, in control mode, it also can operate as the serial interface (UART0,
CSI0,CS1) input/output.
Notes: 1. If using peripheral functions, the direction setting for the respective port bit is not forced
automatically. Port bit direction has to be programmed according to the peripheral function
requirement by setting the port mode register.
2. The reset value of register P2 is 00H. Due to the input mode of the port after reset, the read
input value is determined by the port pins.
(1)
Operation in control mode
7
6
5
4
3
2
1
0
Address
At Reset
P2
P27
P26
P25
P24
P23
P22
P21
P20
FFFFF402H 00H
Note 2
Bit Position
Bit Name
Function
7 to 0
P2n
(n = 7 to 0)
Input/output port
Port
Alternate Pin Name
Remarks
Block Type
Port 2
P20
SI0
Serial interface (UART1, CSI0, CSI1) input/out-
put.
A
P21
SO0
P22
SCK0
P23
SI1
P24
SO1
P25
SCK1
P26
RXD0
P27
TXD0
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