Port 8; Port 8 Data Direction Register (P8Ddr); Port 8 Data Register (P8Dr) - Renesas H8S/2111B Hardware Manual

7.8

Port 8

Port 8 is an 8-bit I/O port. Port 8 pins also function as SCI_1 I/O pins, the IIC_1 I/O pins, LPC I/O
pins, and interrupt input pins. The output type of P86 and SCK1 is NMOS push-pull output. The
output type of SCL1 is NMOS open-drain output and direct bus driving is enabled. Port 8 has the
following registers.

• Port 8 data direction register (P8DDR)

• Port 8 data register (P8DR)

7.8.1 Port 8 Data Direction Register (P8DDR)
P8DDR specifies input or output for the pins of port 8 on a bit-by-bit basis.
Bit Bit Name
7 —
6 P86DDR
5 P85DDR
4 P84DDR
3 P83DDR
2 P82DDR
1 P81DDR
0 P80DDR
7.8.2 Port 8 Data Register (P8DR)
P8DR stores output data for the port 8 pins (P86 to P80).
Bit Bit Name
7 —
6 P86DR
5 P85DR
4 P84DR
3 P83DR
2 P82DR
1 P81DR
0 P80DR
Rev. 1.00, 05/04, page 118 of 544
Initial
Value R/W
1 —
0 W
0 W
0 W
0 W
0 W
0 W
0 W
Initial
Value R/W
1 —
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
Description
Reserved
The initial value should not be changed.
P8DDR has the same address as PBPIN, and if read,
the port B state will be returned.
The corresponding port 8 pins are output ports when
P8DDR bits are set to 1, and input ports when cleared
to 0.
Description
Reserved
The initial value should not be changed.
If a port 8 read is performed while P8DDR bits are set
to 1, the P8DR values are read directly, regardless of
the actual pin states. If a port 8 read is performed while
P8DDR bits are cleared to 0, the pin states are read.