参数资料
型号: M30600E8GP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 71/139页
文件大小: 1782K
代理商: M30600E8GP
Mitsubishi microcomputers
M16C / 60 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
37
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 1.24 shows the configuration of the protect register. The values
in the processor mode register 0 (addresss 000416), processor mode register 1 (address 000516), system
clock control register 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”. Therefore, 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”.
Protection
Figure 1.24. Configuration of protect register
Protect register
Symbol
Address
When reset
PRCR
000A 16
XXXXX000 2
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
)
Enables writing to port P9 direction
register (address 03F316) (Note
)
0 : Write-inhibited
1 : Write-enabled
W
R
Nothing is assigned.
These bits can neither be set nor reset. When read, their contents are
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.
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M30600M8-XXXGP 16-BIT, MROM, MICROCONTROLLER, PQFP100
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