HD6473032F16 Datasheet, PDF (297/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 9 I/O Ports
9.7.2 Register Configuration
Table 9.10 summarizes the registers of port 6.
Table 9.10 Port 6 Registers
Address^*
H'FFC9
H'FFCB
Name
Port 6 data direction
register
Port 6 data register
Note: * Lower 16 bits of the address.
Abbreviation R/W
P6DDR
W
P6DR
R/W
Initial Value
Mode 1 to 5 Mode 6, 7
H'F8
H'80
H'80
H'80
Port 6 Data Direction Register (P6DDR)
P6DDR is an 8-bit write-only register that can select input or output for each pin in port 6.
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
— P6₆DDR P6₅DDR P6₄DDR P6₃DDR P6₂DDR P6₁DDR P6₀DDR
1
0
0
0
0
0
0
0
—
W
W
W
W
W
W
W
Reserved bit
Port 6 data direction 6 to 0
These bits select input or output for port 6 pins
• Modes 1 to 6 (Expanded Modes)
P6₆ to P6₃ function as bus control output pins (LWR, HWR, RD, AS). P6₂ to P6₀ are generic
input/output pins, functioning as output port when bits P6₂DDR to P6₀DDR are set to 1 and
input port when these bits are cleared to 0.
• Mode 7 (Single-Chip Mode)
Port 6 is a generic input/output port. A pin in port 6 becomes an output port if the
corresponding P6DDR bit is set to 1, and an input port if this bit is cleared to 0.
Bit 7 is reserved.
P6DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P6DDR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P6DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Rev. 3.00 Mar 21, 2006 page 267 of 814
REJ09B0302-0300