M30843FJFP

Manufacturer Part NumberM30843FJFP
ManufacturerRenesas Electronics Corporation.
M30843FJFP datasheets

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Page 84/529:

Bus Control

Download datasheet (4Mb)Embed
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8.2 Bus Control
Signals, required to access external devices, are provided and software wait states are inserted as follows.
The signals are available in memory expansion mode and microprocessor mode only.
8.2.1 Address Bus and Data Bus
Address bus is a signal accessing 16-Mbyte space and uses 24 control pins; A
inversed output signal of the highest-order address bit.
Data bus is a signal for data input and output. The DS register selects an 8-bit data bus from D
a 16-bit data bus from D
0
BYTE pin, the data bus accessing the external memory space 3 becomes an 8-bit data bus after reset.
When applying a low-level ("L") signal to the BYTE pin, the data bus accessing the external memory
space 3 becomes the 16-bit data bus.
When changing single-chip mode to memory expansion mode, the address bus is in an indeterminate
state until the microcomputer accesses an external memory space.
8.2.2 Chip-Select Signal
Chip-select signal shares pins with A
_____
determine which CS area is accessed and how many chip-select signals are output. A maximum of four
chip-select signals can be output.
In microprocessor mode, no chip-select signal, aside from A
is output after reset.
The chip-select signal becomes "L" while the microcomputer is accessing the external CSi area (i=0 to 3).
It becomes "H" while the microcomputer is accessing other external memory space.
Figure 8.2 shows an example of the address bus and chip-select signal output.
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for each external space. When applying a high-level ("H") signal to the
15
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which can perform as a chip-select signal,
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7

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