MB90385(2008) View Datasheet(PDF) - Fujitsu
Part Name
Description
Manufacturer
MB90385 Datasheet PDF : 84 Pages
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MB90385 Series
■ MEMORY MAP
MB90385 series allows specifying a memory access mode “single chip mode.”
1. Memory allocation of MB90385
MB90385 series model has 24-bit wide internal address bus and up to 24-bit bus of external address bus.
A maximum of 16-Mbyte memory space of external access memory is accessible.
2. Memory map
(with ROM mirroring
function enabled)
000000H
0000C0H
000100H
Address #1
Peripheral
RAM area
Register
003800H
004000H
010000H
FE0000H
FF0000H
FFFFFFH
Extension IO
area
ROM area
(FF bank image)
ROM area*
ROM area
Model
MB90V495G
MB90F387/MB90F387S
MB90387/MB90387S
Address #1
001900H
000900H
000900H
: Internal access memory
: Access disallowed
* : On MB90387/S or MB90F387/S, to read “FE0000H” to “FEFFFFH” is to read out
“FF0000H” to “FFFFFFH”.
Note : When internal ROM is operating, F2MC-16LX allows viewing ROM data image on FF bank at upper-level of
00 bank. This function is called “mirroring ROM,” which allows effective use of C compiler small model.
F2MC-16LX assigns the same low order 16-bit address to FF bank and 00 bank, which allows referencing
table in ROM without specifying “far” using pointer.
For example, when accessing to “00C000H”, ROM data at “FFC000H” is accessed actually. However, because
ROM area of FF bank exceeds 48 Kbytes, viewing all areas is not possible on 00 bank image. Because
ROM data of “FF4000H” to “FFFFFFH” is viewed on “004000H” to “00FFFFH” image, store a ROM data table
in area “FF4000H” to “FFFFFFH.”
14
DS07-13717-5E
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