HD6417750RF240V Datasheet, PDF (171/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 9 I/O Ports
9.2 Port 4
Port 4 is an 8-bit input-only port. Port 4 pins also function as A/D converter analog input pins. For
details on register addresses, refer to appendix A, On-Chip I/O Register.
• Port 4 register (PORT4)
9.2.1 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
6 P46
Undefined^* R
Undefined^* R
The pin states are always read when a port 4 read
is performed.
5 P45
Undefined^* R
4 P44
Undefined^* R
3 P43
Undefined^* R
2 P42
Undefined^* R
1 P41
Undefined^* R
0 P40
Undefined^* R
Note: * Determined by the states of pins P47 to P40.
Rev. 7.00 Sep. 11, 2009 Page 135 of 566
REJ09B0211-0700