參數資料
型號: M30240S3-XXXFP
廠商: Mitsubishi Electric Corporation
英文描述: SSR H/S ZS CURR SENSE 4-32VDC 50A 600V OTP PNP NO
中文描述: 單片16位CMOS微機
文件頁數: 28/142頁
文件大小: 1637K
代理商: M30240S3-XXXFP
1-28
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Protection
2.13 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 1.14 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 register 0 (address 0006
16
), system clock control register 1 (address 0007
16
) and frequency
synthesizer registers can only be changed when the respective bit in the protect register is set to “1”.
The system clock control registers 0 and 1 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”.
Figure 1.14: Protect register
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
Enables writing to processor mode
registers 0 and 1 (addresses 0004
16
and 0005
16
)
Function
0 : Write-inhibited
1 : Write-enabled
Enables writing to system clock
control registers 0 and 1 (addresses
0006
16
and 0007
16
) and frequency
synthesizer registers (addresses
03DB
16
to 03DF
16
)
W
R
Nothing is assigned.
These bits can neither be set nor reset. When read, their contents are
indeterminate.
Reserved bit
Must always be set to "0"
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