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MB90480 Datasheet(PDF) 75 Page - Fujitsu Component Limited.

Part No. MB90480
Description  16-bit Proprietary Microcontroller
Download  120 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90480 Datasheet(HTML) 75 Page - Fujitsu Component Limited.

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MB90480/485 Series
75
19. Chip Select Function Description
The chip select module generates a chip select signals, which are used to facilitate connections to external
memory devices. The MB90480/485 series has four chip select output pins, each having a chip select area
register setting that specifies the corresponding hardware area and select signal that is output when access to
the corresponding external address is detected.
• Chip select function features
The chip select function uses two 8-bit registers for each output pin. One of these registers (CARx) is able to
detect memory areas in 64 Kbytes units by specifying the upper 8-bit of the address for match detection. The
other register (CMRx) can be used to expand the detection area beyond 64 Kbytes by masking bits for match
detection.
Note that during external bus holds, the CS output is set to high impedance.
(1) Register List
Chip select area mask register (CMRx)
Chip select area register (CARx)
Chip select control register (CSCR)
Chip select active level register (CALR)
0000C0H
0000C2H
0000C4H
0000C6H
Read/write
Initial value
0000C1H
0000C3H
0000C5H
0000C7H
Read/write
Initial value
0000C8H
Read/write
Initial value
0000C9H
Read/write
Initial value
CMR1
CMR0
CAR0
R/W
R/W
CAR1
15
0
CMR3
CMR2
CAR2
R/W
R/W
CAR3
CSCR
R/W
CALR
8 7
R/W
0
R/W
0
R/W
0
R/W
1
R/W
1
R/W
1
R/W
1
76
5
4
3
2
1
0
M6
R/W
0
M7
M5
M4
M3
M2
M1
M0
R/W
1
R/W
1
R/W
1
R/W
1
R/W
1
R/W
1
R/W
1
15
14
13
12
11
10
9
8
A6
R/W
1
A7
A5
A4
A3
A2
A1
A0
R/W
0
R/W
0
R/W
0
R/W
*
76
5
4
3
2
1
0
⎯⎯
OPL3
OPL2
OPL1
OPL0
R/W
0
R/W
0
R/W
0
R/W
0
15
14
13
12
11
10
9
8
⎯⎯
ACTL3
ACTL2
ACTL1
ACTL0
* : The initial value of this bit is “1” or “0”.
The value depends on the mode pin (MD2, MD1 and MD0) .


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