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| 型號(hào)： | MC80C32-30/883:D |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 96/224頁(yè) |
| 文件大小： | 24907K |
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285
7674F–AVR–09/09
ATmega164P/324P/644P
24.8
Self-Programming the Flash
The program memory is updated in a page by page fashion. Before programming a page with
the data stored in the temporary page buffer, the page must be erased. The temporary page buf-
fer is filled one word at a time using SPM and the buffer can be filled either before the Page
Erase command or between a Page Erase and a Page Write operation:
Alternative 1, fill the buffer before a Page Erase
Fill temporary page buffer
Perform a Page Erase
Perform a Page Write
Alternative 2, fill the buffer after Page Erase
Perform a Page Erase
Fill temporary page buffer
Perform a Page Write
If only a part of the page needs to be changed, the rest of the page must be stored (for example
in the temporary page buffer) before the erase, and then be rewritten. When using alternative 1,
the Boot Loader provides an effective Read-Modify-Write feature which allows the user software
to first read the page, do the necessary changes, and then write back the modified data. If alter-
native 2 is used, it is not possible to read the old data while loading since the page is already
erased. The temporary page buffer can be accessed in a random sequence. It is essential that
the page address used in both the Page Erase and Page Write operation is addressing the same
page. See “Simple Assembly Code Example for a Boot Loader” on page 289 for an assembly
code example.
24.8.1
Performing Page Erase by SPM
To execute Page Erase, set up the address in the Z-pointer, write “X0000011” to SPMCSR and
execute SPM within four clock cycles after writing SPMCSR. The data in R1 and R0 is ignored.
The page address must be written to PCPAGE in the Z-register. Other bits in the Z-pointer will
be ignored during this operation.
Page Erase to the RWW section: The NRWW section can be read during the Page Erase.
Page Erase to the NRWW section: The CPU is halted during the operation.
24.8.2
Filling the Temporary Buffer (Page Loading)
To write an instruction word, set up the address in the Z-pointer and data in R1:R0, write
“00000001” to SPMCSR and execute SPM within four clock cycles after writing SPMCSR. The
content of PCWORD in the Z-register is used to address the data in the temporary buffer. The
temporary buffer will auto-erase after a Page Write operation or by writing the RWWSRE bit in
SPMCSR. It is also erased after a system reset. Note that it is not possible to write more than
one time to each address without erasing the temporary buffer.
If the EEPROM is written in the middle of an SPM Page Load operation, all data loaded will be
lost.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR80C32-30/883 | 8-BIT, 30 MHz, MICROCONTROLLER, CQCC44 |
| M44C510D-XXX-DOW | 4-BIT, MROM, MICROCONTROLLER, PDSO44 |
| MQ80C32E-30:D | 8-BIT, 30 MHz, MICROCONTROLLER, CQFP44 |
| MD80C32-36:D | 8-BIT, 36 MHz, MICROCONTROLLER, CDIP40 |
| MQ80C32E-36SCR | 8-BIT, 36 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC-80C32E-30 | 制造商:AIMTEC 制造商全稱:AIMTEC 功能描述:Rad. Tolerant 8-bit ROMless Microcontroller |
| MC-80C32E-30-E | 制造商:AIMTEC 制造商全稱:AIMTEC 功能描述:Rad. Tolerant 8-bit ROMless Microcontroller |
| MC80D21000G | 制造商:COR 功能描述:RN |
| MC80F0104 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
| MC80F0104B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
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