參數(shù)資料
型號(hào)： M50FLW040A_06
廠商： 意法半導(dǎo)體
英文描述： 4-Mbit (5 】 64 Kbyte blocks + 3 】 16 】 4 Kbyte sectors) 3-V supply Firmware Hub / low-pin count Flash memory
中文描述： 4兆位（5】64字節(jié)塊3】16】4 Kbyte的）3 - V電源供電固件集線器/低引腳數(shù)的閃存
文件頁數(shù)： 35/64頁
文件大小： 338K
代理商： M50FLW040A_06
M50FLW040A, M50FLW040BFirmware hub/low pin count (FWH/LPC) interface Configuration Reg-
35/64
6
Firmware hub/low pin count (FWH/LPC) interface
Configuration Registers
When the Firmware Hub Interface/Low Pin Count is selected, several additional registers
can be accessed. These registers control the protection status of the Blocks, read the
General Purpose Input pins and identify the memory using the manufacturer code. See
Table 15
for the memory map of the Configuration Registers. The Configuration registers
are accessed directly without using any specific command code. A single Bus Write or Bus
Read Operation, with the appropriate address (including A22=0), is all that is needed.
6.1
Lock Registers
The Lock Registers control the protection status of the Blocks. Each Block has its own Lock
Register. Three bits within each Lock Register control the protection of each block: the Write
Lock Bit, the Read Lock Bit and the Lock Down Bit.
The Lock Registers can be read and written. Care should be taken, though, when writing.
Once the Lock Down Bit is set, ‘1’, further modifications to the Lock Register cannot be
made until it is cleared again by a reset or power-up.
See
Table 16
for details on the bit definitions of the Lock Registers.
6.1.1
Write Lock
The Write Lock Bit determines whether the contents of the Block can be modified (using the
Program or Erase Command). When the Write Lock Bit is set, ‘1’, the block is write
protected – any operations that attempt to change the data in the block will fail, and the
Status Register will report the error. When the Write Lock Bit is reset, ‘0’, the block is not
write protected by the Lock Register, and may be modified, unless it is write protected by
some other means.
If the Top Block Lock signal, TBL, is Low, V
IL
, then the Top Block (Block 7) is write protected,
and cannot be modified. Similarly, if the Write Protect signal, WP, is Low, V
IL
, then the Main
Blocks (Blocks 0 to 6) are write protected, and cannot be modified.
After power-up, or reset, the Write Lock Bit is always set to ‘1’ (write-protected).
6.1.2
Read Lock
The Read Lock bit determines whether the contents of the Block can be read (in Read
mode). When the Read Lock Bit is set, ‘1’, the block is read protected – any operation that
attempts to read the contents of the block will read 00h instead. When the Read Lock Bit is
reset, ‘0’, read operations are allowed in the Block, and return the value of the data that had
been programmed in the block.
After power-up, or reset, the Read Lock Bit is always reset to ‘0’ (not read-protected).
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M50FLW040AK1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 Mbit (5 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
M50FLW040AK1G 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 Mbit (5 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
M50FLW040AK1P 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 Mbit (5 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
M50FLW040AK1T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 Mbit (5 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
M50FLW040AK1TG 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 Mbit (5 x 64KByte Blocks + 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
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