參數(shù)資料
型號： M30102M3-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù)： 98/166頁
文件大?。?/td> 2060K
代理商： M30102M3-XXXFP
Under
development
Tentative Specifications REV.E1
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
34
Protection
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 1.11.1 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 P0 direction register
(address 00E216) 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 P0.
If, after "1" (write-enabled) has been written to bit "enables writing to port P0 direction register" (bit 2 at
address 000A16), a value is written to any address, the bit automatically reverts to "0" (write-inhibited).
The system clock control registers 0 and 1 and oscillation stop detection register 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 000416
and 000516)
Function
0 : Write-inhibited
1 : Write-enabled
Enables writing to system clock
control registers 0 and 1 (addresses
000616 and 000716) and oscillation
stop detection register (address 000
C16)
Enables writing to port P0 direction
register (address 00E216) (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 1.11.1. Protect register
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