參數(shù)資料
型號: MB90214PF
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, QFP-80
文件頁數(shù): 52/100頁
文件大小: 1681K
代理商: MB90214PF
55
MB90210 Series
11. 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 Area
Write-inhibit RAM area
001100H to 0011FFH (MB90214/P214A/P214B/W214A/W214B)
001100H to 0012FFH (MB90V210)
(3) Block Diagram
WI control register (WICR)
00008EH
Address:
WI control register
7654
3210
Bit
WI
WICR
(—)
(R/W)
(1)
(—)
Read/write
Initial value
W I
4-machine-cycle
skew removal
4-machine-cycle
skew removal
S
Q
R
Access to other area
Internal data bus
SQ
Preceded
R
Write-inhibit
circuit
Select
RAM
decoder
Write-
inhibit
RAM
WR
L
H
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