- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364551 > 8XL54 LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS PDF資料下載
參數(shù)資料
| 型號： | 8XL54 |
| 英文描述： | LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS |
| 中文描述： | 低壓CHMOS單片8位微控制器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 284K |
| 代理商： | 8XL54 |
8XL52/54/58
PROGRAMMING ALGORITHM
Refer to Table 3 and Figures 10 and 11 for address,
data, and control signals set up. To program the
87L5X the following sequence must be exercised.
1. Input the valid address on the address lines.
2. Input the appropriate data byte on the data
lines.
3. Activate the correct combination of control sig-
nals.
4. Raise EA/V
PP
from V
CC
to 12.75V
g
0.25V.
5. Pulse, ALE/PROG 5 times for the OTP ROM
array, and 25 times for the encryption table and
the lock bits.
Repeat 1 through 5 changing the address and data
for the entire array or until the end of the object file is
reached.
PROGRAM VERIFY
Program verify may be done after each byte or block
of bytes is programmed. In either case a complete
verify of the programmed array will ensure reliable
programming of the 8XL5X.
The lock bits cannot be directly verified. Verification
of the lock bits is done by observing that their fea-
tures are enabled.
272468–19
Figure 11. Programming Signals Waveforms
ROM and OTP ROM Lock System
The
grammed, protects the onboard program against
software piracy.
87L5X
program
lock
system,
when
pro-
The 80L5X has a one-level program lock system and
a 64-byte encryption table. See line 2 of Table 4. If
program protection is desired, the user submits the
encryption table with their code, and both the lock-
bit and encryption array are programmed by the fac-
tory. The encryption array is not available without
the lock bit. For the lock bit to be programmed, the
user must submit an encryption table.
The 87L5X has a 3-level program lock system and a
64-byte encryption array. Since this is an OTP ROM
device, all locations are user-programmable. See
Table 4.
Encryption Array
Within the OTP ROM array are 64 bytes of Encryp-
tion Array that are initially unprogrammed (all 1’s).
Every time that a byte is addressed during a verify, 6
address lines are used to select a byte of the En-
cryption Array. This byte is then exclusive-NOR’ed
(XNOR) with the code byte, creating an Encryption
Verify byte. The algorithm, with the array in the un-
programmed state (all 1’s), will return the code in its
original, unmodified form. For programming the En-
cryption Array, refer to Table 3 (Programming the
OTP ROM).
When using the encryption array, one important fac-
tor needs to be considered. If a code byte has the
value 0FFH, verifying the byte will produce the en-
cryption byte value. lf a large block (
l
64 bytes) of
code is left unprogrammed, a verification routine will
display the contents of the encryption array. For this
reason all unused code bytes should be pro-
grammed with some value other than 0FFH, and not
all of them the same value. This will ensure maxi-
mum program protection.
17
相關PDF資料 |
PDF描述 |
|---|---|
| 8XL58 | LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS |
| 8XL52 | FUSE KIT, ASSORTED; Depth, external:165mm; Height:50mm; Width, external:260mm |
| A-1855-06111-UNILAP100E | INSTALLATION TESTER |
| A-1855-06211GB-UNILAP100XE | INSTALLATION TESTER |
| A-225 | Preamp， Non-Audio |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 8XL58 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS |
| 8XLT12.5TAM/BLK)2UGRAAGPS | 功能描述:按鈕開關 8POS BLK P/B ASSY RoHS:否 制造商:C&K Components 觸點形式:2 NC - 2 NO 開關功能:ON ? OFF 電流額定值:4 A 電壓額定值 AC:12 V to 250 V 電壓額定值 DC:12 V to 50 V 功率額定值: 安裝風格:Through Hole 照明:Illuminated 照明顏色:None IP 等級:IP 40 端接類型:Solder 觸點電鍍:Silver 執(zhí)行器:Square 蓋顏色: 封裝: 可燃性等級:UL 94 V-0 |
| 8XTA102UGRAAGPN | 功能描述:SWITCH ASSY 8 POS CUSTOM RoHS:否 類別:開關 >> 配件 系列:- 標準包裝:100 系列:- 其它名稱:886.0007886.0007-ND |
| 8Y1011-Z | 功能描述:SWITCH PUSHBUTTON SPDT 6A 125V RoHS:是 類別:開關 >> 按鈕 系列:8Y 標準包裝:1 系列:A16 類型:標準，發(fā)光式 電路:雙刀雙擲 開關功能:開-瞬時 額定電流:5A（AC） 額定電壓 - AC:125V 額定電壓 - DC:- 觸動器類型:方形，按鈕 顏色 - 致動器/蓋:黃 發(fā)光類型，顏色:LED，黃 發(fā)光電壓:12 VDC 安裝類型:前面板安裝 端接類型:焊接，快速連接 - 0.110"（2.8mm） 防護等級:IP65 - 防塵/防油/防水 特點:- 面板切口尺寸:圓形 - 直徑 16.00mm 包裝:散裝 工作溫度:-10°C ~ 55°C 機械壽命:2,000,000 次循環(huán) 電氣壽命:100,000 次循環(huán) 其它名稱:A165LAYM12D2 |
| 8Y10131121 | 制造商:NICOMATIC LP 功能描述:FEMALE CONNECTOR |
發(fā)布緊急采購，3分鐘左右您將得到回復。