Fujitsu FR81S User Manual
CHAPTER 3: CPU
10. Memory Protection Function (MPU)
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CPU
FUJITSU SEMICONDUCTOR CONFIDENTIAL
32
10.3.3.
Instruction Access Protection Violation Status
Register : IPVSR
Register : IPVSR
The bit configuration of the instruction access protection violation status register is shown.
This register indicates the status when an instruction access protection violation occurs.
The content of this register is updated by hardware only when IPV=0. Only writing 0 to the IPV bit has an
effect. Writes to any other bits and writing 1 to IPV are ignored.
Also see "10.4.2. Instruction Access Protection Violation" and "10.4.7. Notes".
IPVSR : Address 031E
H
(Access : Half-word)
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
Reserved
Initial value
-
-
-
-
-
-
-
-
Attribute R0,W0 R0,W0 R0,W0 R0,W0 R0,W0 R0,W0 R0,W0 R0,W0
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved
SZ[1:0]
MD
Reserved
IPV
Initial value
-
-
0
0
0
-
-
0
Attribute R0,W0 R0,W0 R,WX R,WX
R,WX R0,W0 R0,W0
R,W
[bit15 to bit6, bit2, bit1] Reserved
These bits are reserved. Always write 0 to these bits.
[bit5, bit4] SZ[1:0]
The access size when the violation occurred.
SZ[1:0]
Access size
00
Byte
01
Half-word
10
Word
11
Reserved
[bit3] MD
Indicates the mode of the access.
MD
Operation mode
0
Access in user mode
1
Access in privilege mode
MB91520 Series
MN705-00010-1v0-E
129