Datasheet

Section 9 I/O Ports
Rev.6.00 Mar. 18, 2009 Page 354 of 980
REJ09B0050-0600
9.4 Port 4
Port 4 is an 8-bit input-only port. Port 4 has the following register.
• Port 4 register (PORT4)
9.4.1 Port 4 Register (PORT4)
PORT4 is an 8-bit read-only register that shows port 4 pin states.
PORT4 cannot be modified.
Bit Bit Name Initial Value R/W Description
7 P47 —
*
R The pin states are always read from this register.
6 P46 —
*
R
5 P45 —
*
R
4 P44 —
*
R
3 P43 —
*
R
2 P42 —
*
R
1 P41 —
*
R
0 P40 —
*
R
Note: * Determined by the states of pins P47 to P40.