參數(shù)資料
型號(hào)： M306H3MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP116
封裝： 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件頁(yè)數(shù)： 88/135頁(yè)
文件大?。?/td> 2583K
代理商： M306H3MC-XXXFP
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Rev.1.00
2004.03.23
page 56 of 320
M306H3MC-XXXFP/FCFP
2.6 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 2.6.1 shows the PRCR register. The following lists the registers pro-
tected by the PRCR register.
Registers protected by PRC0 bit: CM0, CM1 and PCLKR registers
Registers protected by PRC1 bit: PM0, PM1 and PM2 registers
Registers protected by PRC2 bit: PD9, S3C and S4C registers
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 instruc-
tion in which the PRC2 bit is set to “1” and the next instruction. The PRC0 and PRC1 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
000A 16
XX000000 2
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.
00
RW
Nothing is assigned. When write, set to “0”. When read, its
content is interdeterminate.
Reserved bit
Must set to “0”
RW
Protect bit 0
Protect bit 1
Protect bit 2
Enable write to CM0, CM1 and
PCLKR registers
0 : Write protected
1 : Write enabled
Enable write to PM0, PM1 and
PM2 registers
0 : Write protected
1 : Write enabled
Enable write to PD9, S3C and
S4C registers
(b5-b3)
(b7-b6)
0
Figure 2.6.1. PRCR Register
相關(guān)PDF資料
PDF描述
M306H3FCFP 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP116
M306H5MG-XXXFP 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP116
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參數(shù)描述
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M306H5MG-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER
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