CHAPTER 12 PORT FUNCTIONS
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User’s Manual U15195EJ5V0UD
12.3.5 Port 4
Port 4 is a 3-bit I/O port in which input or output can be specified in 1-bit units.
7
−
P4
6
−
5
−
4
−
3
−
2
P42
1
P41
0
P40
Address
FFFFF408H
After reset
Undefined
Bit position
Bit name
Function
2 to 0
P4n
(n = 2 to 0)
I/O port
Besides functioning as a port, in control mode, it also can operate as the serial interface (CSI0) I/O.
(1) Operation in control mode
Port
Alternate Pin Name
Remarks
Block Type
P40 SI0
C
P41 SO0
A
Port 4
P42 SCK0
Serial interface (CSI0) I/O
J
Caution P40 and P42 have hysteresis characteristics when the alternate functions are input, but not in the
port mode.
Содержание PD703114
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