參數(shù)資料
型號： M306V5EESP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝： 0.750 INCH, PLASTIC, SDIP-64
文件頁數(shù)： 134/152頁
文件大小： 1963K
代理商： M306V5EESP
M306V5ME-XXXSP
M306V5EESP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
35
Rev. 1.0
2.6 Protection
The protection function is provided so that the values in important registers cannot be changed in the event
that the program runs out of control. Figure 2.6.1 shows the protect register. The values in the processor
mode register 0 (address 000416), processor mode register 1 (address 000516), system clock control reg-
ister 0 (address 000616), system clock control register 1 (address 000716) and port P9 direction register
(address 03F316) can only be changed when the respective bit in the protect register is set to “1”. There-
fore, important outputs can be allocated to port P9.
If, after “1” (write-enabled) has been written to the port P9 direction register write-enable bit (bit 2 at address
000A16), a value is written to any address, the bit automatically reverts to “0” (write-inhibited). However, the
system clock control registers 0 and 1 write-enable bit (bit 0 at 000A16) and processor mode register 0 and
1 write-enable bit (bit 1 at 000A16) do not automatically return to “0” after a value has been written to an
address. The program must therefore be written to return these bits to “0”.
Protect register
Symbol
Address
When reset
PRCR
000A16
XXXXX0002
Bit name
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
0 : Write-inhibited
1 : Write-enabled
PRC1
PRC0
PRC2
Enables writing to processor mode
registers 0 and 1 (addresses 0004 16
and 000516)
Function
0 : Write-inhibited
1 : Write-enabled
Enables writing to system clock
control registers 0 and 1 (addresses
000616 and 000716
)
Enables writing to port P9 direction
register (address 03F3 16)
(Note
)
0 : Write-inhibited
1 : Write-enabled
W
R
Nothing is assigned.
In an attempt to write to these bits, write “0.” The value, if read, turns out to be
indeterminate.
Note: Writing a value to an address after “1” is written to this bit returns the bit
to “0.” Other bits do not automatically return to “0” and they must therefore
be reset by the program.
Figure 2.6.1 Protect register
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相關(guān)代理商/技術(shù)參數(shù)
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M306V5ME 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M306V5ME-101SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M306V5ME-105SPZ 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M306V5ME-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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