- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45046 > M38514E6-XXXFP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO42 PDF資料下載
參數(shù)資料
| 型號： | M38514E6-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 54/91頁 |
| 文件大?。?/td> | 1295K |
| 代理商： | M38514E6-XXXFP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁當(dāng)前第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁
58
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3851 Group
(Built-in 24 KB or more ROM)
Functions To Inhibit Rewriting Flash Memory
Version
To prevent the contents of internal flash memory from being read
out or rewritten easily, this MCU incorporates a ROM code protect
function for use in parallel I/O mode and an ID code check func-
tion for use in standard serial I/O mode.
qROM Code Protect Function (in Parallel I/O Mode)
The ROM code protect function is the function to inhibit reading
out or modifying the contents of internal flash memory by using
the ROM code protect control (address FFDB16) in parallel I/O
mode. Figure 63 shows the ROM code protect control (address
FFDB16). (This address exists in the User ROM area.)
If one or both of the pair of ROM Code Protect Bits is set to “0”,
the ROM code protect is turned on, so that the contents of internal
flash memory are protected against readout and modification. The
ROM code protect is implemented in two levels. If level 2 is se-
lected, 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”, the
ROM code protect is turned off, so that the contents of internal
flash memory can be read out or modified. Once the 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
CPU rewrite mode to rewrite the contents of the ROM Code Pro-
tect Reset Bits.
Fig. 63 Structure of ROM code protect control
ROM code protect control register (address FFDB16) (Note 1)
ROMCP
Reserved bits (“1” at read/write)
ROM code protect level 2 set bits (ROMCP2) (Notes 2, 3)
b3b2
0 0: Protect enabled
0 1: Protect enabled
1 0: Protect enabled
1 1: Protect disabled
ROM code protect reset bits (Note 4)
b5b4
0 0: Protect removed
0 1: Protect set bits effective
1 0: Protect set bits effective
1 1: Protect set bits effective
ROM code protect level 1 set bits (ROMCP1) (Note 2)
b7b6
0 0: Protect enabled
0 1: Protect enabled
1 0: Protect enabled
1 1: Protect disabled
b0
b7
Notes 1: This area is on the ROM in the mask ROM version.
2: When ROM code protect is turned on, the internal flash memory is protected
against readout or modification in parallel I/O mode.
3: When ROM code protect level 2 is turned on, ROM code readout by a shipment
inspection LSI tester, etc. also is inhibited.
4: The ROM code protect reset bits can be used to turn off ROM code protect level 1
and ROM code protect level 2. However, since these bits cannot be modified in
parallel I/O mode, they need to be rewritten in standard serial I/O mode or CPU
rewrite mode.
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M38517M8-XXXFP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| M38517M8-XXXSP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP42 |
| M38513E4FP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| M38517M8-XXXFP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| M38517M8-XXXSP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M38517T-ADS | 功能描述:DEV TMP TRGT BRD FOR M38517RSS & RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:適配器板 適用于相關(guān)產(chǎn)品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE |
| M38517T-PAC | 功能描述:DEV SIMPLE TOOL EMULATOR FOR M38 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 內(nèi)電路編程器、仿真器以及調(diào)試器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 19/Jul/2010 標(biāo)準(zhǔn)包裝:1 系列:* 類型:* 適用于相關(guān)產(chǎn)品:* 所含物品:* |
| M3852 BK001 | 制造商:Alpha Wire 功能描述:CBL 8COND 14AWG BLK 1000' |
| M3852 BK002 | 制造商:Alpha Wire 功能描述:CBL 8COND 14AWG BLK 500' |
| M3852 BK005 | 制造商:Alpha Wire 功能描述:CBL 8COND 14AWG BLK 100' |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。