M30218 Datasheet, PDF (18/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Software Reset
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Software Reset
Writing “1” to bit 3 of the processor mode register 0 (address 000416) applies a (software reset) reset to the
microcomputer. A software reset has almost the same effect as a hardware reset. The contents of internal
RAM are preserved.
Figure DA-5 shows the processor mode register 0 and 1.
Processor mode register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
0 00 0
Symbol
PM0
Address
000416
When reset
XXXX00002
Bit symbol
Reserved bit
Bit name
Function
Must always be set to “0”
RW
PM03
Software reset bit
The device is reset when this bit
is set to “1”. The value of this bit
is “0” when read.
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be
indeterminate.
Note: Set bit 1 of the protect register (address 000A16) to “1” when writing new
values to this register.
Processor mode register 1 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
0
00
Symbol
PM1
Address
000516
When reset
00XXXXX02
Bit symbol
Bit name
Function
RW
Reserved bit
Must always be set to “0”
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be
indeterminate.
Reserved bit
Must always be set to “0”
Note: Set bit 1 of the protect register (address 000A16) to “1” when writing new values
to this register.
Figure DA-5. Processor mode register 0 and 1.
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