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Operating Mode Descriptions

Mode 1 (ZTAT, Mask ROM, and ROMless Versions Only)

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.

(ZTAT and Mask ROM Versions Only)

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

The amount of on-chip ROM that can be used is limited to 56 kbytes.

(ZTAT and Mask ROM Versions Only)

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.

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. Pins P1

function as inputs immediately after a

reset. Each of these pins can be set to output addresses by setting the corresponding bit in the data

direction register (DDR) to 1.

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.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HF234BQ100D3201	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:H8S/2345 F-ZTAT Hardware Manual
HF234BT100D3201	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:H8S/2345 F-ZTAT Hardware Manual
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