HD6412350 Hitachi, HD6412350 Datasheet - Page 93
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HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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3.3
3.3.1
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is disabled, and
8-bit bus mode is set, immediately after a reset.
Ports B and C function as an address bus, port D functions as a data bus, and part of port F carries
bus control signals. However, note that if 16-bit access is designated by the bus controller, the bus
mode switches to 16 bits and port E becomes a data bus.
3.3.2
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is enabled, and
8-bit bus mode is set. immediately after a reset.
Ports B and C function as input ports immediately after a reset. They can each 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. However, note that if 16-bit
access is designated by the bus controller, the bus mode switches to 16 bits and port E becomes a
data bus.
The amount of on-chip ROM that can be used is limited to 56 kbytes.
3.3.3
The CPU can access a 64-kbyte address space in normal 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.
The amount of on-chip ROM that can be used is limited to 56 kbytes.
3.3.4
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.
Ports A, B and C function as an address bus, ports D and E function as a data bus, and part of port
F carries bus control signals.
The initial bus mode after a reset is 16 bits, with 16-bit access to all areas. However, note that if
8-bit access is designated by the bus controller for all areas, the bus mode switches to 8 bits.
Operating Mode Descriptions
Mode 1
Mode 2 (H8S/2351 Only)
Mode 3 (H8S/2351 Only)
Mode 4
73
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