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Chapter 16
Port Functions
Preliminary User’s Manual U15839EE1V0UM00
16.3.4 Port
4
Port 4 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 16-16:
Port 4 (P4)
Remark:
In Input Mode: When the P4 register is read, the pin levels at that time are read. Writing to
the P4 register writes the values to that register. This does not affect the
input pins.
In Output Mode:When the P4 register is read, the values of P4 are read. Writing to the P4
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 P4 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
P4
0
0
P45
P44
P43
P42
P41
P40
FFFFF406H 00H
Note 2
Bit Position
Bit Name
Function
7 to 0
P4n
(n = 7 to 0)
Input/output port
Port
Alternate Pin Name
Remarks
Block Type
Port 4
P40
TIG10/INTP10
Real-time pulse unit (RPU) input or external
interrupt request input.
A
P41
TOG11/TIG11
P42
TOG12/TIG12
P43
TOG13/TIG13
P44
TOG14/TIG14
P45
TIG15/INTP15
Содержание mPD703128
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