- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄25624 > MR80C32E-20 (ATMEL CORP) 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44 PDF資料下載
參數(shù)資料
| 型號： | MR80C32E-20 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大?。?/td> | 3152K |
| 代理商： | MR80C32E-20 |
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頁當前第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
19
7707F–AVR–11/10
AT90USB82/162
For a detailed description of SPI, debugWIRE and Parallel data downloading to the EEPROM,
5.3.1
EEPROM Read/Write Access
The EEPROM Access Registers are accessible in the I/O space.
The write access time for the EEPROM is given in Table 5-2. A self-timing function, however,
lets the user software detect when the next byte can be written. If the user code contains instruc-
tions that write the EEPROM, some precautions must be taken. In heavily filtered power
supplies, V
CC is likely to rise or fall slowly on power-up/down. This causes the device for some
period of time to run at a voltage lower than specified as minimum for the clock frequency used.
See “Preventing EEPROM Corruption” on page 23. for details on how to avoid problems in these
situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be followed.
Refer to the description of the EEPROM Control Register for details on this.
When the EEPROM is read, the CPU is halted for four clock cycles before the next instruction is
executed. When the EEPROM is written, the CPU is halted for two clock cycles before the next
instruction is executed.
5.3.2
The EEPROM Address Register – EEARH and EEARL
Bits 15..12 – Res: Reserved Bits
These bits are reserved bits in the AT90USB82/162 and will always read as zero.
Bits 11..0 – EEAR8..0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
512. The initial value of EEAR is undefined. A proper value must be written before the EEPROM
may be accessed.
5.3.3
The EEPROM Data Register – EEDR
Bits 7..0 – EEDR7.0: EEPROM Data
For the EEPROM write operation, the EEDR Register contains the data to be written to the
EEPROM in the address given by the EEAR Register. For the EEPROM read operation, the
EEDR contains the data read out from the EEPROM at the address given by EEAR.
Bit
151413
1211
10
9
8
–
EEAR11
EEAR10
EEAR9
EEAR8
EEARH
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEARL
76
54
3
2
1
0
Read/Write
R
R/W
Initial Value
0
X
XX
X
Bit
765432
1
0
MSB
LSB
EEDR
Read/Write
R/W
Initial Value
000000
0
相關PDF資料 |
PDF描述 |
|---|---|
| MV80C51T-20D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| MT80C51C-36D | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PQFP44 |
| MD80C32E-16SCD | 8-BIT, 16 MHz, MICROCONTROLLER, CDIP40 |
| MD80C52CXXX-16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MD80C32-20SC | 8-BIT, 20 MHz, MICROCONTROLLER, CDIP40 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MR80C51BH | 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space |
| MR80C86 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC |
| MR80C86-2 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86-2/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復。