HD6473847RHV Datasheet, PDF (220/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 8 I/O Ports
8.2 Port 4
Port 4 is an I/O port also functioning as an interrupt input pin and SCI I/O pin. Figure 8.2 shows
its pin configuration.
Port 4
P43/
P42/TXD32
P41/RXD32
P40/SCK32
Figure 8.2 Port 4 Pin Configuration
Port 4 has the following registers.
• Port data register 4 (PDR4)
• Port control register 4 (PCR4)
• Serial port control register (SPCR)
8.2.1 Port Data Register 4 (PDR4)
PDR4 is a register that stores data of port 4.
Initial
Bit
Bit Name Value R/W Description
7 to 4 ⎯
All 1
⎯
Reserved
These bits are always read as 1.
3
P43
1
2
P42
0
1
P41
0
0
P40
0
R
If port 4 is read while PCR4 bits are set to 1, the values
R/W ^{stored in PDR4 are read, regardless of the actual pin}
states. If port 4 is read while PCR4 bits are cleared to 0,
R/W _{the pin states are read.}
R/W
Rev. 7.00 Mar. 08, 2010 Page 188 of 510
REJ09B0024-0700