- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄25639 > MD80C52CXXX-16SCD (ATMEL CORP) 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 PDF資料下載
參數(shù)資料
| 型號： | MD80C52CXXX-16SCD |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁數(shù)： | 57/80頁 |
| 文件大?。?/td> | 5152K |
| 代理商： | MD80C52CXXX-16SCD |
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頁第54頁第55頁第56頁當前第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
257
XMEGA A [MANUAL]
8077I–AVR–11/2012
23.4.1 Key and State Memory
The AES key and state memory are both 16 x 8-bit memories that are accessible through the KEY and STATE registers,
respectively.
Each memory has two 4-bit address pointers used to address the memory for read and write, respectively. The initial
value of the pointers is zero. After a read or write operation to the STATE or KEY register, the appropriate pointer is
automatically incremented. Accessing (read or write) the control register (CTRL) will reset all pointers to zero. A pointer
overflow (a sequential read or write done more than 16 times) will also set the affected pointer to zero. The pointers are
not accessible from software. Read and write memory pointers are both incremented during write operations in XOR
mode.
Access to the KEY and STATE registers is possible only when encryption/decryption is not in progress.
Figure 23-2. The state memory with pointers and register.
The state memory contains the AES state throughout the encryption/decryption process. The initial value of the state is
the initial data (i.e., plaintext in the encryption mode, and ciphertext in the decryption mode). The last value of the state is
the encrypted/decrypted data.
Figure 23-3. The key memory with pointers and register.
In the AES crypto module, the following definition of the key is used:
In encryption mode, the key is the one defined in the AES standard.
4-bit state write
address pointer
1
-
14
15
STATE
0
4-bit state read
address pointer
Reset pointer
reset or access
to AES Control
reset or access
to AES Control
STATE[read pointer]
xor
XOR
I/O Data Bus
4-bit key write
address pointer
1
-
14
15
KEY
0
4-bit key read
address pointer
Reset pointer
reset or
access to CTRL
reset or
access to CTRL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MQ80C52TXXX-25SCR | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44 |
| MQ80C52CXXX-30/883D | 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQFP44 |
| MR83C154XXX-25P883 | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| MS80C51-12D | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| MT80C51T-16R | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MD80C86 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MD80C862 | 制造商:Intel 功能描述:PROCESSOR:MICRO-PROCESSOR |
| MD80C86-2 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MD80C86-2/883 | 制造商:Intersil Corporation 功能描述:MPU 16BIT CMOS 8MHZ 40CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:CPU 16BILT 5V CMOS 8MHZ 40CDIP - Bulk |
| MD80C86-2/B | 制造商:Intersil Corporation 功能描述:MPU 16BIT CMOS 8MHZ 40CDIP - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。