HD6413007F20 Datasheet, PDF (286/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8. I/O Ports
Port 7 Data Register (P7DR)
Bit
7
6
5
4
3
2
1
0
P7₇
P7₆
P7₅
P7₄
P7₃
P7₂
P7₁
P7₀
Initial value
⎯*
⎯*
⎯*
⎯*
⎯*
⎯*
⎯*
⎯*
Read/Write
R
R
R
R
R
R
R
R
Note: * Determined by pins P7₇ to P7₀ .
When port 7 is read, the pin logic levels are always read. P7DR cannot be modified.
8.5 Port 8
8.5.1 Overview
Port
8
is
a
5-bit
input/output
port
that
is
also
used
for
CS
3
to
CS
0
output,
RFSH
output,
IRQ
3
to
IRQ
0
input,
and
A/D
converter
ADTRG
input.
Figure
8.4
shows
the
pin
configuration
of
port
8.
See table 8.8 for the selection of pin functions.
See section 15, A/D Converter, for a description of the A/D converter's ADTRG input pin.
The
IRQ
3
to
IRQ
0
functions
are
selected
by
IER
settings,
regardless
of
whether
the
pin
is
used
for
input or output. Caution is therefore required. For details see section 5, Interrupt Controller.
When
DRAM
is
connected
to
areas
2
to
5,
the
CS
3
and
CS
2
output
pins
function
as
RAS
output
pins for each area. For details see section 6.5, DRAM Interface.
Pins in port 8 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Pins P8₂ to P8₀ have Schmitt-trigger inputs.
Rev.5.00 Sep. 12, 2007 Page 256 of 764
REJ09B0396-0500