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参数资料
型号： EVAL-ADUC7122QSPZ
厂商： Analog Devices Inc
文件页数： 31/96页
文件大小： 0K
描述： BOARD EVALUATION FOR ADUC7122
设计资源： EVAL-ADUC7122 Schematic
ADUC7122 Gerber Files
ADUC7122 BOM
标准包装： 1
系列： MicroConverter® ADuC7xxx
类型： MCU
适用于相关产品： ADUC7122
所含物品： 板
ADuC7122
Rev. 0 | Page 37 of 96
FLASH/EE MEMORY SECURITY
The 126 kB of Flash/EE memory available to the user can be
read and write protected. Bit 31 of the FEE0PRO/FEE0HID
MMR protects the 126 kB from being read through JTAG or
the serial downloader. The other 31 bits of this register protect
writing to the Flash/EE memory; each bit protects four pages,
that is, 2 kB. Write protection is activated for all access types.
FEE1PRO and FEE1HID similarly protect the second 64 kB
block. All 32 bits of this are used to protect four pages at a time.
Three Levels of Protection
Protection can be set and removed by writing directly into
FEExHID MMR. This protection does not remain after reset.
Protection can be set by writing into FEExPRO MMR. It takes
effect only after a save protection command (0x0C) and a reset.
The FEExPRO MMR is protected by a key to avoid direct access.
The key is saved once and must be entered again to modify
FEExPRO. A mass erase sets the key back to 0xFFFF but also
erases all the user code.
The Flash/EE memory can be permanently protected by using
the FEExPRO MMR and a particular value of the 0xDEADDEAD
key. Entering the key again to modify the FEExPRO register is
not allowed.
Sequence to Write the Key
1.
Write the bit in FEExPRO corresponding to the page to be
protected.
2.
Enable key protection by setting Bit 6 of FEExMOD (Bit 5
must equal 0).
3.
Write a 32-bit key in FEExADR, FEExDAT.
4.
Run the write key command 0×0C in FEExCON; wait for
the read to be successful by monitoring FEExSTA.
5.
Reset the part.
To remove or modify the protection, the same sequence is used
with a modified value of FEExPRO. If the key chosen is the value
0xDEADDEAD, then the memory protection cannot be removed.
Only a mass erase unprotects the part; however, it also erases all
user code.
The sequence to write the key is shown in the following example;
this protects writing Page 4 to Page 7 of the Flash/EE memory:
FEE0PRO=0xFFFFFFFD;
//Protect pages 4 to 7
FEE0MOD=0x48;
//Write key enable
FEE0ADR=0x1234;
//16 bit key value
FEE0DAT=0x5678;
//16 bit key value
FEE0CON= 0x0C;
// Write key command
The same sequence should be followed to protect the part
permanently with FEExADR = 0xDEAD and FEExDAT =
0xDEADDEAD.
FLASH/EE CONTROL INTERFACE
Table 38. FEE0DAT Register
Name
Address
Default Value
Access
FEE0DAT
0xFFFF0E0C
0xXXXX
R/W
FEE0DAT is a 16-bit data register.
Table 39. FEE0ADR Register
Name
Address
Default Value
Access
FEE0ADR
0xFFFF0E10
0x0000
R/W
FEE0ADR is a 16-bit address register.
Table 40. FEE0SGN Register
Name
Address
Default Value
Access
FEE0SGN
0xFFFF0E18
0xFFFFFF
R
FEE0SGN is a 24-bit code signature.
Table 41. FEE0PRO Register
Name
Address
Default Value
Access
FEE0PRO
0xFFFF0E1C
0x00000000
R/W
FEE0PRO provides protection following a subsequent reset. It
requires a software key (see Table 57). As stated previously, each
bit from 30 to 0 of the FEExPRO register protects a 2 kB block
of memory; that is, setting Bit 0 low protects Page 0 to Page 3,
and setting Bit 2 low protects Page 8 to Page 11.
Table 42. FEE0HID Register
Name
Address
Default Value
Access
FEE0HID
0xFFFF0E20
0xFFFFFFFF
R/W
FEE0HID provides immediate protection. It does not require
any software keys (see Table 57).
Command Sequence for Executing a Mass Erase
FEE0DAT = 0x3CFF;
FEE0ADR = 0xFFC3;
FEE0MOD = FEE0MOD|0x8;
//Erase key enable
FEE0CON = 0x06;
//Mass erase command
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