r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 234
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r5s77631ay266bgv
Manufacturer Part Number
r5s77631ay266bgv
Description
Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S77631AY266BGV.pdf
(2026 pages)
- Current page: 234 of 2026
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Section 6 Memory Management Unit (MMU)
6.5.3
An instruction TLB protection violation exception occurs when, even though an ITLB entry
contains address translation information matching the virtual address to which an instruction
access is made, the actual access type is not permitted by the access right specified by the PR bit.
The instruction TLB protection violation exception processing carried out by hardware and
software is shown below.
Hardware Processing: In the event of an instruction TLB protection violation exception,
hardware carries out the following processing:
1. Sets the VPN of the virtual address at which the exception occurred in PTEH.
2. Sets the virtual address at which the exception occurred in TEA.
3. Sets exception code H'0A0 in EXPEVT.
4. Sets the PC value indicating the address of the instruction at which the exception occurred in
5. Sets the SR contents at the time of the exception in SSR. The R15 contents at this time are
6. Sets the MD bit in SR to 1, and switches to privileged mode.
7. Sets the BL bit in SR to 1, and masks subsequent exception requests.
8. Sets the RB bit in SR to 1.
9. Branches to the address obtained by adding offset H'0000 0100 to the contents of VBR, and
Software Processing (Instruction TLB Protection Violation Exception Handling Routine):
Resolve the instruction TLB protection violation, execute the exception handling return instruction
(RTE), terminate the exception handling routine, and return control to the normal flow. The RTE
instruction should be issued at least one instruction after the LDTLB instruction.
Rev. 1.00 Oct. 01, 2007 Page 168 of 1956
REJ09B0256-0100
SPC. If the exception occurred at a delay slot, sets the PC value indicating the address of the
delayed branch instruction in SPC.
saved in SGR.
starts the instruction TLB protection violation exception handling routine.
Instruction TLB Protection Violation Exception
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