HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 207

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

8.4
Port 3 is an 8-bit I/O port. Port 3 pins also function as a bidirectional data bus, XBS bidirectional
data bus, and LPC input/output pins. Port 3 functions change according to the operating mode.
Port 3 has the following registers.
8.4.1
P3DDR specifies input or output for the pins of port 3 on a bit-by-bit basis.
Bit
7
6
5
4
3
2
1
0
8.4.2
P3DR stores output data of port 3.
Bit
7
6
5
4
3
2
1
0
Port 3 data direction register (P3DDR)
Port 3 data register (P3DR)
Port 3 pull-up MOS control register (P3PCR)
Bit Name
P37DDR
P36DDR
P35DDR
P34DDR
P33DDR
P32DDR
P31DDR
P30DDR
Bit Name
P37DR
P36DR
P35DR
P34DR
P33DR
P32DR
P31DR
P30DR
Port 3
Port 3 Data Direction Register (P3DDR)
Port 3 Data Register (P3DR)
Initial Value
0
0
0
0
0
0
0
0
Initial Value
0
0
0
0
0
0
0
0
R/W
W
W
W
W
W
W
W
W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Modes 1, 2, and 3 (EXPE = 1)
The input/output direction specified by P3DDR is
ignored, and pins automatically function as data I/O
pins.
Modes 2 and 3 (EXPE = 0)
The corresponding port 3 pins are output ports
when P3DDR bits are set to 1, and input ports when
cleared to 0.
Description
If a port 3 read is performed while P3DDR bits are
set to 1, the P3DR values are read directly,
regardless of the actual pin states. If a port 3 read is
performed while P3DDR bits are cleared to 0, the
pin states are read.
Rev. 2.0, 08/02, page 167 of 788