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參數(shù)資料
| 型號： | M38503E4SS |
| 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： | M38503E4SS |
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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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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| M38503G4AFP#U1 | 功能描述:IC 740/3850 MCU QZ-ROM 42SSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
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| M38503M2404F | 制造商:Panasonic Industrial Company 功能描述:IC |
| M38503M4A-210SP | 制造商:Renesas Electronics Corporation 功能描述: |
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