HD6473032F16 Datasheet, PDF (283/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 9 I/O Ports
9.3.2 Register Configuration
Table 9.3 summarizes the registers of port 2.
Table 9.3 Port 2 Registers
Address^* Name
Abbreviation R/W
H'FFC1
Port 2 data direction
P2DDR
W
register
H'FFC3
Port 2 data register
P2DR
R/W
H'FFD8
Port 2 input pull-up MOS P2PCR
R/W
control register
Note: * Lower 16 bits of the address.
Initial Value
Modes 1 to 4 Modes 5 to 7
H'FF
H'00
H'00
H'00
H'00
H'00
Port 2 Data Direction Register (P2DDR)
P2DDR is an 8-bit write-only register that can select input or output for each pin in port 2.
Bit
7
6
5
4
3
2
1
0
P2₇DDR P2₆DDR P2₅DDR P2₄DDR P2₃DDR P2₂DDR P2₁DDR P2₀DDR
Modes ^{Initial value 1}
1
1
1
1
1
1
1
1 to 4 _{Read/Write —}
—
—
—
—
—
—
—
Modes ^{Initial value 0}
0
0
0
0
0
0
0
5 to 7 _{Read/Write W}
W
W
W
W
W
W
W
Port 2 data direction 7 to 0
These bits select input or
output for port 2 pins
• Modes 1 to 4 (Expanded Modes with On-Chip ROM Disabled)
P2DDR values are fixed at 1 and cannot be modified. Port 2 functions as an address bus.
• Modes 5 and 6 (Expanded Modes with On-Chip ROM Enabled)
Following a reset, port 2 is an input port. A pin in port 2 becomes an address output pin if the
corresponding P2DDR bit is set to 1, and a generic input port if this bit is cleared to 0.
• Mode 7 (Single-Chip Mode)
Port 2 functions as an input/output port. A pin in port 2 becomes an output port if the
corresponding P2DDR bit is set to 1, and an input port if this bit is cleared to 0.
Rev. 3.00 Mar 21, 2006 page 253 of 814
REJ09B0302-0300