參數(shù)資料
型號: MB90P641APFV
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 17 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, LQFP-100
文件頁數(shù): 35/94頁
文件大小: 1542K
代理商: MB90P641APFV
40
MB90640A Series
5. Chip Select Function
This module generates chip select signals to simplify connection of memory or I/O devices.
The module has 8 chip select output pins. The hardware outputs the chip select signals from the pins when it
detects access of an address in the areas specified in the pin registers.
(1)
Register Configuration
(2)
Block Diagram
: 000049H
: 00004BH
: 00004DH
: 00004FH
Address :
: 000048H
: 00004AH
: 00004CH
: 00004EH
Address :
R/W
————
ACTL
OPEL CSA1
CSA0
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
R/W
Initial value
---- 0000B
————
ACTL
OPEL CSA1
CSA0
bit 15
bit 14
bit 13
bit 12
bit 11
bit 10
bit 9
bit 8
Initial value
---- 0000B
R/W
: Readable and writable
: Unused
CSCR1
CSCR3
CSCR5
CSCR7
CSCR0
CSCR2
CSCR4
CSCR6
Chip select control register 1, 3, 5, 7
Chip select control register 0, 2, 4, 6
Selector
Chip select control register 0
Chip select control register 1
CS0
(For the program ROM area)
CS1
CS6
Address (from CPU)
Address decoder
A23
A16 A15
A08 A07
A00
Decode signal
Program area
Decode
Selection setting
Selector
Chip select control register 6
Chip select control register 7
CS7
Selection setting
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