HD64F2168 Datasheet, PDF (257/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

8.8 Port 8
Port 8 is an 8-bit I/O port. Port 8 pins also function as the A/D converter external trigger input pin,
SCI_0, SCI_1, and SCI_2 clock input/output pins, IIC_0 and IIC_1 input/output pins, TMR_0,
TMR_1, TMR_X, and TMR_Y input pins, and interrupt input pins. Port 8 is an NMOS push-pull
output. Port 8 has the following registers.
• Port 8 data direction register (P8DDR)
• Port 8 data register (P8DR)
8.8.1 Port 8 Data Direction Register (P8DDR)
The individual bits of P8DDR specify input or output for the pins of port 8.
Bit Bit Name Initial Value R/W Description
7
P87DDR 0
6
P86DDR 0
5
P85DDR 0
4
P84DDR 0
3
P83DDR 0
2
P82DDR 0
W This register is assigned to the same address as that
W ^{of PBPIN. When this register is read, the port B states}
are read.
W _{If port 8 pins are specified for use as the general I/O}
W _{port, the corresponding port 8 pins are output ports}
W ^{when the P8DDR bits are set to 1, and input ports}
when cleared to 0.
W
1
P81DDR 0
W
0
P80DDR 0
W
8.8.2 Port 8 Data Register (P8DR)
P8DR stores output data for the port 8 pins.
Bit Bit Name Initial Value R/W Description
7
P87DR
0
6
P86DR
0
5
P85DR
0
4
P84DR
0
3
P83DR
0
R/W P8DR stores output data for the port 8 pins that are
R/W ^{used as the general output port.}
R/W ^{If a port 8 read is performed while the P8DDR bits are}
set to 1, the P8DR values are read. If a port 8 read is
R/W _{performed while the P8DDR bits are cleared to 0, the}
R/W ^{pin states are read.}
2
P82DR
0
R/W
1
P81DR
0
R/W
0
P80DR
0
R/W
Rev. 3.00, 03/04, page 217 of 830