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SH7721 bảng dữ liệu(PDF) 258 Page - Renesas Technology Corp

tên linh kiện SH7721
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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SH7721 bảng dữ liệu(HTML) 258 Page - Renesas Technology Corp

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Section 4 Memory Management Unit (MMU)
Rev. 3.00 Jan. 18, 2008 Page 196 of 1458
REJ09B0033-0300
4.6.3
Usage Examples
(1)
Invalidating Specific Entries
Specific TLB entries can be invalidated by writing 0 to the entry’s V bit. R0 specifies the write
data and R1 specifies the address.
; R0=H'1547 381C
R1=H'F201 3000
; MMUCR.IX=0
; the V bit of way 0 of the entry selected by the VPN(16–12)=B'1 0011
; index is cleared to 0,achieving invalidation.
MOV.L
R0,@R1
(2)
Reading the Data of a Specific Entry
This example reads the data section of a specific TLB entry. The bit order indicated in the data
field in figure 4.17 (2) is read. R0 specifies the address and the data section of a selected entry is
read to R1.
; R0
=H'F300 4300
VPN(16-12)=B'00100
Way 3
; MOV.L @R0,R1
4.7
Usage Note
The following operations should be performed in the P1 or P2 area. In addition, when the P0, P3,
or U0 area is accessed consecutively (this access includes instruction fetching), the instruction
code should be placed at least two instructions after the instruction that executes the following
operations.
1. Modification of SR.MD or SR.BL
2. Execution of the LDTLB instruction
3. Write to the memory-mapped TLB
4. Modification of MMUCR
5. Modification of PTEH.ASID



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