r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 208

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

7. Memory Management Unit (MMU)
7.5.3
A TLB load instruction (LDTLB) is provided for recording UTLB entries. When an LDTLB
instruction is issued, this LSI copies the contents of PTEH and PTEL (also the contents of PTEA
in TLB extended mode) to the UTLB entry indicated by the URC bit in MMUCR. ITLB entries
are not updated by the LDTLB instruction, and therefore address translation information purged
from the UTLB entry may still remain in the ITLB entry. As the LDTLB instruction changes
address translation information, ensure that it is issued by a program in the P1 or P2 area.
After the LDTLB instruction has been executed, execute one of the following three methods
before an access (include an instruction fetch) the area where TLB is used to translate the address
is performed.
1. Execute a branch using the RTE instruction. In this case, the branch destination may be the
2. Execute the ICBI instruction for any address (including non-cacheable area).
3. If the LT bit in IRMCR is 0 (initial value) before executing the LDTLB instruction, the
Note that the method 3 may not be guaranteed in the future SuperH Series. Therefore, it is
recommended that the method 1 or 2 should be used for being compatible with the future SuperH
Series.
Rev.1.00 Jan. 10, 2008 Page 178 of 1658
REJ09B0261-0100
area where TLB is used to translate the address.
specific instruction does not need to be executed. However, note that the CPU processing
performance will be lowered because the instruction fetch is performed again for the next
instruction after MMUCR has been updated.
MMU Instruction (LDTLB)