562
Chapter 16
Port Functions
Preliminary User’s Manual U15839EE1V0UM00
16.3.3 Port
3
Port 3 is a 6-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 16-13:
Port 3 (P3)
Remark:
In Input Mode: When the P3 register is read, the pin levels at that time are read. Writing to
the P3 register writes the values to that register. This does not affect the
input pins.
In Output Mode:When the P3 register is read, the values of P3 are read. Writing to the P3
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 real-time pulse unit (RPU)
input/output and external interrupt request input.
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 P3 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
P3
0
0
P35
P34
P33
P32
P31
P30
FFFFF404H 00H
Note 2
Bit Position
Bit Name
Function
7 to 0
P3n
(n = 7 to 0)
Input/output port
Port
Alternate Pin Name
Remarks
Block Type
Port 3
P30
TIG00/INTP00
Real-time pulse unit (RPU) input or external
interrupt request input.
A
P31
TOG01/TIG01
P32
TOG02/TIG02
P33
TOG03/TIG03
P34
TOG04/TIG04
P35
TIG05/INTP05
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