HD6413007F20 Datasheet, PDF (290/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8. I/O Ports
Pin
P8 /CS /IRQ
1
3
1
P8₀/RFSH/IRQ₀
Pin Functions and Selection Method
The DRAM interface settings by bits DRAS2 to DRAS0 in DRCRA, and
bit P8 DDR, select the pin function as follows.
1
DRAM interface
(3) in
settings
(1) in table below (2) in table below table
below
P8₁DDR
Pin function
0
P8₁
input
1
CS
3
output
Note:
*
CS
3
is
output
as
RAS₃.
DRAM interface
setting
(1)
(3)
0
P8₁
input
IRQ
1
input
1
P8₁
output
(2)
(3)
⎯
CS
3
output*
(2)
DRAS2
0
1
DRAS1
0
1
0
1
DRAS0
01010101
Bit RFSHE in DRCRA and bit P8₀DDR select the pin function as follows.
If areas 2 to 5 are not designated as DRAM space, do not set bit RFSHE
in DRCRA to 1.
RFSHE
0
1
P8₀DDR
Pin function
0
P8₀ input
1
P8₀ output
IRQ
0
input
⎯
RFSH output
Rev.5.00 Sep. 12, 2007 Page 260 of 764
REJ09B0396-0500