HD6413007F20 Datasheet, PDF (287/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Port 8
8. I/O Ports
Port 8 pins
Pin functions in modes 1 to 4
P8₄ / CS₀
P8₃ / CS₁ / IRQ₃ / ADTRG
P8₂ / CS₂ / IRQ₂
P8₁ / CS₃ / IRQ₁
P8₀ / RFSH /IRQ ₀
P8₄ (input)/ CS₀ (output)
P8₃ (input)/ CS₁ (output)/ IRQ₃ (input) / ADTRG (input)
P8₂ (input)/ CS₂ (output)/ IRQ₂ (input)
P8₁ (input/output)/CS₃ (output)/IRQ₁ (input)
P8₀ (input/output)/ RFSH (output)/ IRQ ₀ (input)
Figure 8.4 Port 8 Pin Configuration
8.5.2 Register Configuration
Table 8.7 summarizes the registers of port 8.
Table 8.7 Port 8 Registers
Address*
Name
Abbreviation
R/W
H'EE007
Port 8 data direction
P8DDR
W
register
H'FFFD7
Port 8 data register
P8DR
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
Mode 1 to 4
H'F0
H'E0
Port 8 Data Direction Register (P8DDR): P8DDR is an 8-bit write-only register that can select
input or output for each pin in port 8.
Bits 7 to 5 are reserved. They are fixed at 1, and cannot be modified.
Bit
7
6
5
4
3
2
1
0
⎯
⎯
⎯ P8₄DDR P8₃DDR P8₂DDR P8₁DDR P8₀DDR
Modes ^{Initial value 1}
1
1
1
0
0
0
0
1 to 4 _{Read/Write ⎯}
⎯
⎯
W
W
W
W
W
Reserved bits
Port 8 data direction 4 to 0
These bits select input or
output for port 8 pins
Rev.5.00 Sep. 12, 2007 Page 257 of 764
REJ09B0396-0500