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參數(shù)資料
| 型號(hào)： | MCCF68HC08LK60 |
| 廠(chǎng)商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, UUC150 |
| 封裝： | 0.226 X 0.242 INCH, BUMP, WAFER-150 |
| 文件頁(yè)數(shù)： | 188/248頁(yè) |
| 文件大?。?/td> | 1727K |
| 代理商： | MCCF68HC08LK60 |
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FLASH Memory
MC68HC08LK60 MC68HC908LK60 Advance Information Data Sheet, Rev. 1.1
44
Freescale Semiconductor
4.11 FLASH Program and Margin Read Operation
Programming of this FLASH array is done on a page basis where one page equals eight bytes. The
purpose of the margin read mode is to ensure that data has been programmed with sufficient margin for
long term data retention. During a margin read, the control gates of the selected memory bits are held at
a slightly negative voltage by an internal charge pump. Reading the data in margin mode is the same as
for ordinary read mode except that a built-in counter stretches the data access for an additional eight
cycles to allow sensing of the lower cell current. In short, a margin read applies a more stringent condition
on the bitcell during read which ensures the data will be valid throughout the life of the product. A margin
read can only follow a program operation. Refer to Chapter 20 Preliminary Electrical Specifications.
The procedure for programming the FLASH memory is:
1.
Establish pump frequency by configuring the PLL.
2.
Set the PGM bit and program FDIV0 appropriately. This configures the memory for program
operation and enables the latching of address and data for programming.
3.
Write data to the page (eight bytes) being programmed.
4.
Set the HVEN bit.
5.
Wait for a time, tSTEP.
6.
Clear the HVEN bit.
7.
Wait for a time, tHVTV.
8.
Set the MARG bit.
9.
Wait for a time, tVTP.
10.
Clear the PGM bit.
11.
Wait for a time, tHVD.
12.
Read the page of data (this is in margin mode.)
13.
Clear the MARG bit.
14.
If any programmed bits do not read correctly, repeat the process from step 2 through step 13 up to
maximum program pulses (see Chapter 20 Preliminary Electrical Specifications).
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