參數(shù)資料
型號: M30201
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機
文件頁數(shù): 142/159頁
文件大小: 2319K
代理商: M30201
Appendix Parallel I/O Mode
Peimnay
Unde
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
142
Figure CC-5. Protect control address
Protect function
In parallel I/O mode, the internal flash memory has the “protect function” available. This function protects
the flash memory contents from being read or rewritten easily.
Depending on the content at the protect control address (FFFFF
16
) in parallel I/O mode, this function
inhibits the flash memory contents against read or modification. The protect control address (FFFFF
16
) is
shown in Figure CC-5 . (This address exists in the user ROM area.)
The protect function is enabled by setting one of the two protect set bits to “0”, so that the internal flash
memory contents are inhibited against read or modification. The protect function is disabled by setting
both of the two protect reset bits to “00”, so that the internal flash memory contents can be read or
modified. Once the protect function is set, the user cannot change settings of the protect clear bits while
in parallel I/O mode. Settings of the protect reset bits can only be changed in CPU rewrite mode.
Symbol
ROMCP
Address
FFFFF
16
When shipping
FF
16
Protect control address
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
1
b2
1
b1
1
b0
1
00: Protect removed
01: Protect set bit effective
10: Protect set bit effective
11: Protect set bit effective
00: Protect enabled
01: Protect enabled
10: Protect enabled
11: Protect disabled
Protect reset bit
Protect set bit
ROMCR
ROMCP
b5 b4
b7 b6
Note 1: When protect is turned on, the flash memory version is protected against readout or modification
in parallel I/O mode.
Note 2: The protect reset bits can be used to turn off protect . However, since these bits cannot be
changed in parallel I/O mode, they need to be rewritten in CPU rewrite mode.
Reserved bit
Always set to "1".
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