參數(shù)資料
型號： T89C51RD2-SLRIM
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 50/104頁
文件大?。?/td> 798K
代理商： T89C51RD2-SLRIM
50
T89C51RD2
4243G
–
8051
–
05/03
EEPROM Data Memory
General Description
The EEPROM memory block contains 2048 bytes and is organized in 32 pages (or
rows) of 64 bytes. The necessary high programming voltage is generated on-chip using
the standard Vcc pin of the microcontroller.
The EEPROM memory block is located at the addresses 0000h to 07FFh of the XRAM
memory space and is selected by setting control bits in the EECON register.
A read in the EEPROM memory is done with a MOVX instruction.
A physical write in the EEPROM memory is done in two steps : write data in the column
latches and transfer of all data latches in a EEPROM memory row (programming).
The number of data written in the page may vary from 1 to 64 (the page size). When
programming, only the data written in the column latch are programmed. This provides
the capability to program the whole memory by bytes, by page or by a number of bytes
in a page.
Write Data in the Column
Latches
Data is written by byte to the column latches as if it was in an external RAM memory.
Out of the 16 address bits of the data pointer, the 10 MSB are used for page selection
and 6 are used for byte selection. Between two EEPROM programming, all addresses in
the column latches must remain in the same page, thus the 10MSB must be unchanged.
The following procedure is used to write in the colums latches :
Map the program space (Set bit EEE of EECON register)
Load DPTR with the address to write
Load A register with the data to be written
Execute a MOVX @DPTR, A
If needed loop the three last instructions until the end of a 64bytes page
Programming
The EEPROM programming consists on the following actions :
write one or more bytes in a page in the column latches. Normally, all bytes must
belong to the same page; if this is not the case, the first page address is latched and
the others are discarded.
Set EETIM with the value corresponding to the XTAL frequency.
Launch the programming by writing the control sequence (52h or 50h followed by
A2h or A0h) to the EECON register (see Table 32).
EEBUSY flag in EECON is then set by hardware to indicate that programming is in
progress and that EEPROM segment is not available for read.
The end of programming is signaled by a hardware clear of the EEBUSY flag.
Example : ..... ; DPTR = EEPROM data pointer, A = Data to write
Wait : MOV A,EECON
ANL A,#01h
JNZ Wait
MOV EETIM,#3Ch ; 12MHz*5 = 3Ch
MOV EECON,#02h ; EEE=1 EEPROM mapped
MOVX @DPTR,A ; Write data to EEPROM
MOV EECON,#50h or 52h ; Write Sequence
MOV EECON,#A0h or A2h
....
相關(guān)PDF資料
PDF描述
T89C51RD2-SLSCL 0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSCM 0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSIL 0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSIM 0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLUCM 0 to 40 MHz Flash Programmable 8-bit Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T89C51RD2-SLRI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSCL 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSC-L 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSCM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSC-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*