參數(shù)資料
型號： M30100
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機
文件頁數(shù)： 35/164頁
文件大?。?/td> 3302K
代理商： M30100
deveopment
Protection
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
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 0004
16
), processor mode register 1 (address 0005
16
), system clock control reg-
ister 0 (address 0006
16
), system clock control register 1 (address 0007
16
) and port P0 direction register
(address 00E2
16
) 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 000A
16
), 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
000A
16
) and processor mode register 0 and 1 write-enable bit (bit 1 at 000A
16
) 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
PRCR
Address
000A
16
When reset
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 0004
16
and 0005
16
)
Enables writing to port P0 direction
register (address 00E2
16
) (Note
)
Function
0 : Write-inhibited
1 : Write-enabled
Enables writing to system clock
control registers 0 and 1 (addresses
0006
16
and 0007
16
) and oscillation
stop detection register (address 000
C
16
)
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.
A
A
A
A
A
A
A
A
Figure 1.11.1. Protect register
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