HD643303x Hitachi, HD643303x Datasheet - Page 569
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
(572 pages)
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Reset in T
T
the input state. AS, RD, and WR go high, and the data bus goes to the high-impedance state. The
address bus is initialized to the low output level 0.5 state after the low level of RES is sampled.
The same timing applies when a reset occurs during a wait state (T
2
RD (read access)
(mode 1)
WR (write access)
(mode 1)
Data bus
(write access)
(mode 1)
I/O port
(modes 1 to 3)
state of an external memory access cycle. As soon as RES goes low, all ports are initialized to
ø
RES
Internal
reset signal
Address bus
(mode 1)
AS (mode 1)
2
State: Figure D-2 is a timing diagram for the case in which RES goes low during the
Figure D-2 Reset during Memory Access (Reset during T
Access to external address
T
1
553
T
2
T
W
3
).
H'000000
2
State)
High impedance
High impedance
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