HD6413008VF25 Datasheet, PDF (199/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Port 8
7. I/O Ports
Port 8 pins
P8₄ / CS₀
P8₃ / CS₁ / IRQ₃ / ADTRG
P8₂ / CS₂ / IRQ₂
P8₁ / CS₃ / IRQ₁
P8₀ / IRQ ₀
P8₄ (input)/ CS₀ (output)
P8₃ (input)/ CS₁ (output)/ IRQ₃ (input) / ADTRG (input)
P8₂ (input)/ CS₂ (output)/ IRQ₂ (input)
P8₁ (input)/ CS₃ (output)/ IRQ₁ (input)
P8₀ (input/output)/ IRQ₀ (input)
Figure 7.4 Port 8 Pin Configuration
7.5.2 Register Descriptions
Table 7.7 summarizes the registers of port 8.
Table 7.7 Port 8 Registers
Address* Name
Abbreviation R/W
H'EE007 Port 8 data direction register
P8DDR
W
H'FFFD7 Port 8 data register
P8DR
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
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
Initial value
1
1
1
1
0
0
0
0
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
When
bits
in
P8DDR
bit
are
set
to
1,
P8₄
to
P8₁
become
CS
0
to
CS
3
output
pins.
When
bits
in
P8DDR are cleared to 0, the corresponding pins become input ports.
Rev.4.00 Aug. 20, 2007 Page 153 of 638
REJ09B0395-0400