R01UH0823EJ0100 Rev.1.00
Page 331 of 1823
Jul 31, 2019
RX23W Group
17. Memory-Protection Unit (MPU)
17.2.12
Data-Hit Region Register (MHITD)
UHACD[2:0] Bits (Data-Hit Region Access Control Bits in User Mode)
These bits hold the user-mode access control bits (REPAGEn.UAC[2:0]) that have been set for the region where a data
memory-protection error was generated or the region that produced a hit in region searching.
When an error is generated in an overlap between regions or a hit was generated in region searching, the value stored
here is the logical OR of the user-mode access control bits for the corresponding regions (including the background
region).
Address(es): 0008 652Ch
b31
b30
b29
b28
b27
b26
b25
b24
b23
b22
b21
b20
b19
b18
b17
b16
—
—
—
—
—
—
—
—
HITD[7:0]
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
—
—
—
—
—
—
—
—
—
—
—
—
UHACD[2:0]
—
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
—
Reserved
The read value is 0. The write value should always be 0.
R/W
b3 to b1
Data-Hit Region
Access Control
Bits in User
Mode
b3
0: Reading prohibited
1: Reading permitted
b2
0: Writing prohibited
1: Writing permitted
b1
0: Execution prohibited
1: Execution permitted
R
b15 to b4
—
Reserved
The read value is 0. The write value should always be 0.
R/W
b23 to b16
Data-Hit Region
When the data memory-protection error generation bit (MPESTS.DMPER) = 1, [b23:b16] =
0000 0000b indicates that attempted access to the background region led to a data
memory-protection error.
Other than above
b23
0: Neither a data memory-protection error nor a search hit was generated in region 7.
1: A data memory-protection error or search hit was generated in region 7.
b22
0: Neither a data memory-protection error nor a search hit was generated in region 6.
1: A data memory-protection error or search hit was generated in region 6.
b21
0: Neither a data memory-protection error nor a search hit was generated in region 5.
1: A data memory-protection error or search hit was generated in region 5.
b20
0: Neither a data memory-protection error nor a search hit was generated in region 4.
1: A data memory-protection error or search hit was generated in region 4.
b19
0: Neither a data memory-protection error nor a search hit was generated in region 3.
1: A data memory-protection error or search hit was generated in region 3.
b18
0: Neither a data memory-protection error nor a search hit was generated in region 2.
1: A data memory-protection error or search hit was generated in region 2.
b17
0: Neither a data memory-protection error nor a search hit was generated in region 1.
1: A data memory-protection error or search hit was generated in region 1.
b16
0: Neither a data memory-protection error nor a search hit was generated in region 0.
1: A data memory-protection error or search hit was generated in region 0.
R
b31 to b24
—
Reserved
The read value is 0. The write value should always be 0.
R/W