R01UH0823EJ0100 Rev.1.00
Page 323 of 1823
Jul 31, 2019
RX23W Group
17. Memory-Protection Unit (MPU)
17.2.3
Memory-Protection Enable Register (MPEN)
MPEN Bit (Memory-Protection Enable)
This bit enables or disables the memory protection.
After 1 has been written to this bit, address checking for memory protection by the CPU starts on the execution of a
branch instruction (RTE or RTFI) that shifts operation to the user mode.
Address(es): 0008 6500h
b31
b30
b29
b28
b27
b26
b25
b24
b23
b22
b21
b20
b19
b18
b17
b16
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
MPEN
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Function
R/W
b0
Memory-Protection Enable
1: The memory protection is enabled.
0: The memory protection is disabled.
R/W
b31 to b1
—
Reserved
The read value is 0. The write value should always be 0 R/W