Hitachi H8S/2678 Series Reference Manual page 39

Type
Interrupt signals
Address bus
Data bus
Bus control
22
Pin No.
Symbol FP-144
NMI 38
IRQ15 to
87, 86,
IRQ0
84 to 81,
61, 60,
130 to 127,
110 to 107,
(IRQ15) to 59 to 52,
(IRQ0) 112, 111,
4 to 2,
142 to 140
A23 to A0 32 to 27,
25 to 20,
18 to 13,
11 to 6
D15 to D0 72 to 75,
77 to 80,
63 to 66,
68 to 71
CS7 to CS0
112, 111,
106 to 101
AS
91
RD
90
HWR
89
LWR
88
I/O Name and Function
Input Nonmaskable interrupt: Requests a
nonmaskable interrupt. Fix high when
not used.
Input Interrupt request 15 to 0: These pins
request a maskable interrupt.
Output Address bus: These pins output an
address.
Input/ Data bus: These pins constitute a
output bidirectional data bus.
Output Chip select: Signals that select areas 7
to 0.
Output Address strobe: When this pin is low, it
indicates that address output on the
address bus is valid.
Output Read: When this pin is low, it indicates
that the external address space is being
read.
Output High write/write enable: Strobe signal
indicating that external space is to be
written, and the upper half (D15 to D8)
of the data bus is enabled.
Write enable signal for DRAM interface
space.
Output Low write: Strobe signal indicating that
external space is to be written, and the
lower half (D7 to D0) of the data bus is
enabled.