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SH7616 Datasheet(PDF) 59 Page - Renesas Technology Corp |
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SH7616 Datasheet(HTML) 59 Page - Renesas Technology Corp |
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59 / 935 page  Section 2 CPU Rev. 2.00 Mar 09, 2006 page 33 of 906 REJ09B0292-0200 The name Ix is an alias for R8. The other aliases are assigned as follows: Ax0: .REG (R4) Ax1: .REG (R5) Ix: .REG (R8) Ay0: .REG (R6) Ay1: .REG (R7) Iy: .REG (R9) As0: .REG (R4) defined when an alias is required for single data transfer As1: .REG (R5) defined when an alias is required for single data transfer As2: .REG (R2) defined when an alias is required for single data transfer As3: .REG (R3) defined when an alias is required for single data transfer Is: .REG (R8) defined when an alias is required for single data transfer 2.1.2 Control Registers The six 32-bit control registers consist of the status register (SR), repeat start register (RS), repeat end register (RE), global base register (GBR), vector base register (VBR), and modulo register (MOD). The SR register indicates processing states. The GBR register functions as a base address for the indirect GBR addressing mode, and is used for such as on-chip peripheral module register data transfers. The VBR register functions as the base address of the exception processing vector area (including interrupts). The RS and RE registers are used for program repeat (loop) control. The repeat count is designated in the SR register repeat counter (RC), the repeat start address in the RS register, and the repeat end address in the RE register. However, note that the address values stored in the RS and RE registers are not necessarily always the same as the physical start and end address values of the repeat. The MOD register is used for modulo addressing to buffer the repeat data. The modulo addressing designation is made by DMX or DMY, the modulo end address (ME) is designated in the upper 16 bits of the MOD register, and the modulo start address (MS) is designated in the lower 16 bits. Note that the DMX and DMY bits cannot simultaneously designate modulo addressing. Modulo addressing is possible with X and Y data transfer instructions (MOVX, MOVY). It is not possible with single data transfer instructions (MOVS). |
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