Renesas M32R/ECU Series User Manual page 157

6
Lock Bit Status Register (FLBST)
b0 1 2
FLBST0
? ? ?
b Bit Name
0 No function assigned.
1 FLBST0
Lock bit 0
2–8 No function assigned.
9 FLBST1
Lock bit 1
10–15 No function assigned.
The Lock Bit Status Register is a read-only register, which is included for each memory block independently of
one another. The following shows how the lock bits in this register are set.
a) Setting the lock bit to "0" (protected)
Issue the Lock Bit Program command (H'7777) to the memory block to be protected.
b) Setting the lock bit to "1" (not protected)
Set the Flash Control Register 2 FPROT bit to invalidate protection by a block bit, then issue the Block Erase
command (H'2020) or Erase All Unlocked Blocks command (H'A7A7) to erase the memory block which is to
be unprotected. This is the only way to set the lock bit to "1". In no way can the lock bit alone be set to "1".
c) Lock bit status after reset
Because the lock bits are nonvolatile, they are unaffected by a reset and power-off.
3 4 5 6
? ? ? ?
6.5 Programming the Internal Flash Memory
7 8 9 10
FLBST1
? ? ? ?
Function
0: Protected
1: Not protected
0: Protected
1: Not protected
(Same content as FLBST0 is output)
6-28
INTERNAL MEMORY
11 12 13 14
? ? ? ?
<After reset: Undefined>
32180 Group User's Manual (Rev.1.0)
b15
?
R W
? –
R –
? –
R –
? –