566
Chapter 16
Port Functions
Preliminary User’s Manual U15839EE1V0UM00
16.3.5 Port
5
Port 5 is a 7-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 16-19:
Port 5 (P5)
Remark:
In Input Mode: When the P5 register is read, the pin levels at that time are read. Writing to
the P5 register writes the values to that register. This does not affect the
input pins.
In Output Mode:When the P5 register is read, the values of P5 are read. Writing to the P5
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, as the serial interface (FCAN4
Note 3
) and as external interrupt request input.
(1)
Operation in control mode
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.
3. CAN module 4 is available in the derivatives µPD703129 (A) and µPD703129 (A1) only.
7
6
5
4
3
2
1
0
Address
At Reset
P5
0
P56
P55
P54
P53
P52
P51
P50
FFFFF408H 00H
Note 2
Bit Position
Bit Name
Function
7 to 0
P5n
(n = 7 to 0)
Input/output port
Port
Alternate Pin Name
Remarks
Block Type
Port 5
P50
CRXD4
Real-time pulse unit (RPU) input/output, serial
interface (FCAN4
Note 3
) input/output or external
interrupt request input.
A
P51
CTXD4
P52
INTP4
P53
INTP5
P54
TI0/INTP20
P55
TI1/INTP21
P56
TO0
Содержание mPD703128
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