參數(shù)資料
型號(hào): MB90474PF
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁(yè)數(shù): 90/118頁(yè)
文件大?。?/td> 1199K
代理商: MB90474PF
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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)
0000C0H
0000C2H
0000C4H
0000C6H
Read/write
Default value
0000C1H
0000C3H
0000C5H
0000C7H
Read/write
Default value
0000C8H
Read/write
Default value
0000C9H
Default value
CMR1
CMR0
CAR0
(R/W)
CAR1
15
0
CMR3
CMR2
CAR2
(R/W)
CAR3
CSCR
(R/W)
CALR
(R/W)
87
(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
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