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| 型號： | M38503MXH |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 46/86頁 |
| 文件大?。?/td> | 1193K |
| 代理商： | M38503MXH |
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46
3850 Group (Spec. H)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Functions To Inhibit Rewriting Flash Memory
Version
To prevent the contents of the flash memory version from being read
out or rewritten easily, the device incorporates a ROM code protect
function for use in parallel I/O mode and an ID code check function
for use in standard serial I/O mode.
ROM code protect function
The ROM code protect function is the function inhibit reading out or
modifying the contents of the flash memory version by using the
ROM code protect control address (FFDB
16
) during parallel I/O
mode. Figure 50 shows the ROM code protect control address
(FFDB
16
). (This address exists in the user ROM area.)
If one of the pair of ROM code protect bits is set to
“
0
”
, ROM code
protect is turned on, so that the contents of the flash memory ver-
sion are protected against readout and modification. ROM code
protect is implemented in two levels. If level 2 is selected, the flash
memory is protected even against readout by a shipment inspection
LSI tester, etc. When an attempt is made to select both level 1 and
level 2, level 2 is selected by default.
If both of the two ROM code protect reset bits are set to
“
00
”
, ROM
code protect is turned off, so that the contents of the flash memory
version can be read out or modified. Once ROM code protect is
turned on, the contents of the ROM code protect reset bits cannot
be modified in parallel I/O mode. Use the serial I/O or some other
mode to rewrite the contents of the ROM code protect reset bits.
Fig. 50 ROM code protect control address
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