參數(shù)資料
型號: MB90W224AZF
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 16-BIT, UVPROM, 16 MHz, MICROCONTROLLER, CQFP120
封裝: CERAMIC, QFP-120
文件頁數(shù): 63/105頁
文件大小: 1800K
代理商: MB90W224AZF
MB90220 Series
60
14. Write-inhibit RAM
The write-inhibit RAM is write-protectable with the WI pin input. Maintaining the “L” level input to the WI pin
prevents a certain area of RAM from being written. The WI pin has a 4-machine-cycle filter.
(1) Register Configuration
(2) Write-inhibit RAM Areas
Write-inhibit RAM areas:
000D00H to 000EFFH (MB90223)
001300H to 0014FFH (MB90224/P224A/P224B/W224A/W224B)
001500H to 0018FFH (MB90V220)
(3) Block Diagram
00008E H
(—)(—)(—)(R/W)(—)(—)(—)(—)
———
WI
——
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
WICR
- - - X - - - -
Register name Address
Initial value
WI Control Register (WICR)
WI
4-machine cycle smoothing circuit
S
R
Q
Priority
R
Q
Other area access
Write-inhibit
circuit
Write-inhibit
RAM
decoder
Select
Internal data bus
L
H
WR
S
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