Section 2 CPU
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treated as independent registers during single data transfers. The load/store data length for the
A0G, A1G registers is 8 bits.
If DSP registers are used as source registers in word mode, when data is stored from any registers
other than A0G, A1G, the data in the upper word of the register is transferred. In the case of the
A0, A1 registers, the guard bits are disregarded. When the A0G, A1G registers are the source
registers in word mode, only 8 bits of the data are stored from the registers; the upper bits are sign-
extended.
If the DSP registers are used as destination registers in word mode, the load is to the upper word of
the register, with the exception of A0G, A1G. When data is loaded to any register other than A0G,
A1G, the lower word of the register is cleared to 0. In the case of the A0, A1 registers, the data
sign is extended and stored in the guard bits; the lower word is cleared to 0. When the A0G, A1G
registers are the destination registers in word mode, the least significant 8 bits of the data are
loaded into the registers; the A0, A1 registers are not zero cleared but retain their previous values.
If the DSP registers are used as source registers in longword mode, when data is stored from any
registers other than A0G, A1G, the 32 bits (data) of the register are transferred. When the A0, A1
registers are used as the source registers the guard bits are disregarded. When the A0G, A1G
registers are the source registers in longword mode, only 8 bits of the data are stored from the
registers; the upper bits are sign-extended.
If the DSP registers are used as destination registers in longword mode, the load is to the 32 bits of
the register, with the exception of A0G, A1G. In the case of the A0, A1 registers, the data sign is
extended and stored in the guard bits. When the A0G, A1G registers are the destination registers in
longword mode, the least significant 8 bits of the data are loaded into the registers; the A0, A1
registers are not zero cleared but retain their previous values.
Tables 2.4 and 2.5 indicate the register data formats for DSP instructions. Some registers cannot
be accessed by certain instructions. For example, the PMULS instruction can designate the A1
register as a source register but cannot designate A0 as such. Refer to the instruction explanations
for details.
Figure 2.8 shows the relationship between the buses and the DSP registers during transfers.
Summary of Contents for SH7616
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Page 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Page 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Page 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Page 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Page 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Page 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Page 935: ...SH7616 Hardware Manual ...