HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 96
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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3.3.5
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.
Pins P1
part of port F carries bus control signals. Pins P1
reset. They can each be set to output addresses by setting the corresponding bits in the data
direction register (DDR) to 1.
The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, note that if at
least one area is designated for 16-bit access by the bus controller, the bus mode switches to 16
bits and port E becomes a data bus.
3.3.6
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is enabled.
Pins P1
be set to output addresses by setting the corresponding bits in the data direction register (DDR) to
1. Port D functions as a data bus, and part of port F carries bus control signals.
The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, if any area is
designated as 16-bit access space by the bus controller, 16-bit bus mode is set and port E becomes
a data bus.
3.3.7
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is enabled,
but external addresses cannot be accessed.
All I/O ports are available for use as input-output ports.
Notes: 1. Not used on ROMless version.
3.3.8
Modes 8 and 9 are not supported in the H8S/2345 Series, and must not be set.
76
3
3
2. The upper address pins (A
to P1
to P1
Mode 5 *
Mode 6 *
Mode 7 *
Modes 8 and 9 (F-ZTAT Version Only)
immediately after a reset. To use the upper address pins (A
necessary to first set the corresponding bits in the port 1 data direction register
(P1DDR) to 1.
0
0
, ports A, B and C function as an address bus, port D function as a data bus, and
, ports A, B and C function as input ports immediately after a reset. They can each
2
1
1
23
to A
20
) cannot be used as outputs in modes 4 or 5
3
to P1
0
function as inputs immediately after a
23
to A
20
) as outputs, it is
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