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| 型號： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 82/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
26
Freescale Semiconductor
4.8.3
FLASH Configuration Register (FCNFG)
Bits 7 through 5 can be read or written at any time. Bits 4 through 0 always read 0 and cannot be written.
4.8.4
FLASH Protection Register (FPROT and NVPROT)
During reset, the contents of the nonvolatile location NVPROT is copied from FLASH into FPROT. Bits 0, 1, and 2 are not used
and each always reads as 0. This register can be read at any time, but user program writes have no meaning or effect.
Background debug commands can write to FPROT.
Table 4-7 FOPT Register Field Descriptions
Field
Description
7
KEYEN
Backdoor Key Mechanism Enable — When this bit is 0, the backdoor key mechanism cannot be used to dis-
engage security. The backdoor key mechanism is accessible only from user (secured) firmware. BDM com-
mands cannot be used to write key comparison values that would unlock the backdoor key. For more detailed
information about the backdoor key mechanism, refer to Section 4.7.”
0
No backdoor key access allowed
1
If user firmware writes an 8-byte value that matches the nonvolatile backdoor key (NVBACKKEY through
NVBACKKEY+7 in that order), security is temporarily disengaged until the next MCU reset
6
FNORED
Vector Redirection Disable — When this bit is 1, then vector redirection is disabled.
0
Vector redirection enabled
1
Vector redirection disabled
1:0
SEC0[1:0]
Security State Code — This 2-bit field determines the security state of the MCU as shown in Table 4-8. When
the MCU is secure, the contents of RAM and FLASH memory cannot be accessed by instructions from any
unsecured source including the background debug interface. For more detailed information about security, refer
to Section 4.7. SEC01:SEC00 changes to 1:0 after successful backdoor key entry or a successful blank check
of FLASH.
Table 4-8 Security States
SEC01:SEC00
Description
0:0
secure
0:1
secure
1:0
unsecured
1:1
secure
7
6
5
4
3
2
1
0
R
0
KEYACC
0
W
Reset:
0
= Unimplemented or Reserved
Figure 4-7 FLASH Configuration Register (FCNFG)
Table 4-9 FCNFG Register Field Descriptions
Field
Description
5
KEYACC
Enable Writing of Access Key — This bit enables writing of the backdoor comparison key. For more detailed
information about the backdoor key mechanism, refer to Section 4.7.
0
Writes to 0xFFB0–0xFFB7 are interpreted as the start of a FLASH programming or erase command
1
Writes to NVBACKKEY (0xFFB0–0xFFB7) are interpreted as comparison key writes
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