M16C62_M Datasheet, PDF (320/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Protect
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Protect register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
PRCR
Address When reset
000A16 XXXXX0002
Bit symbol
Bit name
Function
PRC0
Enables writing to system clock
control registers 0 and 1 (addresses ^{0 : Write-inhibited}
000616 and 000716)
1 : Write-enabled
RW
PRC1
Enables writing to processor mode
registers 0 and 1 (addresses 000416
and 000516)
0 : Write-inhibited
1 : Write-enabled
PRC2
Enables writing to port P9 direction
register (address 03F316) and SI/Oi
control register (i=3,4) (addresses
036216 and 036616) (Note)
0 : Write-inhibited
1 : Write-enabled
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 2.1.1. Protect register
2-3