Hitachi H8S/2670, Reference Manual

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