參數(shù)資料
型號: MB90470
廠商: Fujitsu Limited
英文描述: 16-Bit Proprietary Microcontroller
中文描述: 16位微控制器專有
文件頁數(shù): 73/118頁
文件大小: 555K
代理商: MB90470
MB90470 Series
73
18. Overview of the Chip Select Function
This module issues chip select signals in order to facilitate connection to external memory. There are four chip
select output pins, with hardware areas set using a register for each output, so that the select signal is output
from the related pin whenever access to an external address is detected.
Features of the chip select function
The chip select function has two 8-bit registers for settings for each of the four output pins. One register (CARx)
is used to specify the upper 8 bits of the address for match detection, thereby providing memory area detection
in 64 KB units. The other register (CMRx) can be set to detect areas larger than 64 KB by masking bits in the
match detection value.
Note that the CS output is set to high impedance during a bus hold condition.
(1) Register List
Chip select area MASK register (CMRx)
Chip select area register (CARx)
Chip select control register (CSCR)
Chip selector active level register (CALR)
0000C0
H
0000C2
H
0000C4
H
0000C6
H
Read/write
Default value
0000C1
H
0000C3
H
0000C5
H
0000C7
H
Read/write
Default value
0000C8
H
Read/write
Default value
0000C9
H
Default value
CMR1
CMR0
CAR0
(R/W)
(R/W)
CAR1
15
0
CMR3
CMR2
CAR2
(R/W)
(R/W)
CAR3
CSCR
(R/W)
CALR
(R/W)
8 7
(R/W)
( 0 )
(R/W)
( 0 )
(R/W)
( 0 )
(R/W)
( 1 )
(R/W)
( 1 )
(R/W)
( 1)
(R/W)
( 1 )
7
6
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)
(
)
7
6
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
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MB90470B 16-Bit Proprietary Microcontroller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB90470B 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90473 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90473PF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90473PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90474 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller