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參數(shù)資料
| 型號： | M306V8FJFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116 |
| 封裝： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件頁數(shù)： | 66/77頁 |
| 文件大?。?/td> | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 67 of 363
REJ03B0082-0131
Protection
In the event that a program runs out of control, this function protects the important registers so that they will
not be rewritten easily. Figure 6.1 shows the PRCR register. The following lists the registers protected by
the PRCR register.
Registers protected by PRC0 bit: CM0, CM1, CM2 and PCLKR registers, reserved register address
001C16.
Registers protected by PRC1 bit: PM0 and PM1 registers, reserved registers address 001E16, 039E16,
034816, and 034916
Registers protected by PRC2 bit: PD9 register, reserved registers address 036216 and 036616
Set the PRC2 bit to “1” (write enabled) and then write to any address, and the PRC2 bit will be cleared to “0”
(write protected). The registers protected by the PRC2 bit should be changed in the next instruction after
setting the PRC2 bit to “1”. Make sure no interrupts or DMA transfers will occur between the instruction in
which the PRC2 bit is set to “1” and the next instruction. The PRC0, PRC1 and PRC3 bits are not automati-
cally cleared to “0” by writing to any address. They can only be cleared in a program.
Protect register
Symbol
Address
After reset
PRCR
000A16
XX0000002
Bit name
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
0 : Write protected
1 : Write enabled
PRC1
PRC0
PRC2
Function
RW
Note: The PRC2 bit is set to “0” by writing to any address after setting it to “1”. Other bits are not set to “0”
by writing to any address, and must therefore be set in a program.
0
RW
Nothing is assigned. When write, set to “0”. When read, its
content is indeterminate.
Reserved bits
Must set to “0”
Protect bit 0
Protect bit 1
Protect bit 2
Enable write to CM0, CM1, CM2,
PCLKR and register 001C16
0 : Write protected
1 : Write enabled
Enable write to PM0, PM1
registers 001E16, 039E16,
034816 and 034916
0 : Write protected
1 : Write enabled
(Note)
Enable write to PD9, registers
036216 and 036616
RW
(b5-b3)
(b7-b6)
0
Figure 6.1. PRCR Register
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