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★ HARDWARE Manual ★ SCU User's Manual
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SCU User's Manual/Chapter 4 DSP Control
■4.2 Command list
Below is a list of instructions used in SCU-DSP.
◆Arithmetic instructions- NOP
- I won't do anything.
- AND
- Performs a logical AND between [ACL] and [PL].
- OR
- Performs the logical OR of [ACL] and [PL].
- XOR
- Performs exclusive OR of [ACL] and [PL].
- ADD
- Add [ACL] and [PL].
- SUB
- Subtract [PL] from [ACL].
- AD2
- Add [ACH][ACL] and [PH][PL].
- S.R.
- Shift [ACL] to the right by 1 bit and store the LSB in the carry flag.
- RR
- Rotate [ACL] to the right by 1 bit and store the LSB in the carry flag.
- SL
- Shift [ACL] to the left by 1 bit and store 0 in the LSB of [ACL] and the MSB in the carry flag.
- R.L.
- Rotate [ACL] to the left by 1 bit and store the MSB in the carry flag.
- RL8
- Rotate [ACL] to the left by 8 bits and store b24 in the carry flag.
- NOP
- I won't do anything.
- MOV[s],X
- Transfer data from data RAM to [RX].
- MOV MUL,P
- Transfer the data of [MULTIPLIER] to [PH][PL].
- MOV[s],P
- Transfer data from data RAM to [PL].
- NOP
- I won't do anything.
- MOV[s],Y
- Transfer data from data RAM to [RY].
- CLR A
- Clear [ACH] and [ACL] to 0.
- MOV ALU,A
- Transfer the data of [ALU] to [ACH][ACL].
- MOV[s],A
- Transfer data from data RAM to [ACL].
- NOP
- I won't do anything.
- MOV SImm,[d]
- Stores the SImm (short immediate) data in the data RAM or register specified by [d].
- MOV [s],[d]
- Transfers data from the data RAM or register specified by [s] to the data RAM or register specified by [d].
- MVI Imm,[d]
- Stores the Imm (immediate) data in the data RAM or register specified by [d].
- MVI Imm,[d],Z
- Only when Z (zero flag) of the program control port is 1, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],NZ
- Only when Z (zero flag) of the program control port is 0, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],S
- Only when S (sign flag) of the program control port is 1, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],NS
- Only when S (sign flag) of the program control port is 0, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],C
- Only when C (carry flag) of the program control port is 1, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],NC
- Only when C (carry flag) of the program control port is 0, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],TO
- Only when TO (D0 bus DMA execution flag) of the program control port is 1, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],NTO
- Only when TO (D0 bus DMA execution flag) of the program control port is 0, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],ZS
- Only when either Z (zero flag) or S (sign flag) of the program control port is 1, Imm (immediate) data is stored in the data RAM or register specified by [d].
- MVI Imm,[d],NZS
- Only when Z (zero flag) and S (sign flag) of the program control port are both 0, Imm (immediate) data is stored in the data RAM or register specified by [d].
- DMA D0,[RAM],SImm
- Set the SImm (short immediate) data as a transfer counter in the transfer word counter ([TN0]), and use the D0 bus to transfer the data from the outside to the RAM area specified by [RAM]. The transfer start address ([RA0]) and transfer word counter ([TN0]) are updated to the values at the end of the transfer.
- DMA [RAM],D0,SImm
- Set the SImm (short immediate) data as a transfer counter in the transfer word counter ([TN0]), and transfer the data externally from the RAM area specified by [RAM] using the D0 bus. The transfer start address ([WA0]) and transfer word counter ([TN0]) are updated to the values at the end of the transfer.
- DMA D0,[RAM],[s]
- Set the data in the data RAM specified by [s] to the transfer word counter ([TN0]) as a transfer counter, and use the D0 bus to externally transfer the data to the RAM area specified by [RAM]. forward. The transfer start address ([RA0]) and transfer word counter ([TN0]) are updated to the values at the end of the transfer.
- DMA [RAM],D0,[s]
- Set the data in the data RAM specified by [s] to the transfer word counter ([TN0]) as a transfer counter, and transfer the data externally from the RAM area specified by [RAM] using the D0 bus. forward. The transfer start address ([WA0]) and transfer word counter ([TN0]) are updated to the values at the end of the transfer.
- DMAH D0,[RAM],SImm
- Set the SImm (short immediate) data as a transfer counter in the transfer word counter ([TN0]), and transfer the data from the outside to the RAM area specified by [RAM] using the D0 bus. The transfer start address ([RA0]) and transfer word count counter ([TN0]) retain the values they had when the transfer started.
- DMAH [RAM],D0,SImm
- Set the SImm (short immediate) data as a transfer counter in the transfer word counter ([TN0]), and transfer the data externally from the RAM area specified by [RAM] using the D0 bus. The transfer start address ([WA0]) and transfer word count counter ([TN0]) retain the values they had when the transfer started.
- DMAH D0,[RAM],[s]
- Set the data in the data RAM specified by [s] to the transfer word counter ([TN0]) as a transfer counter, and use the D0 bus to externally transfer the data to the RAM area specified by [RAM]. forward. The transfer start address ([RA0]) and transfer word count counter ([TN0]) retain the values they had when the transfer started.
- DMAH [RAM],D0,[s]
- Set the data in the data RAM specified by [s] to the transfer word counter ([TN0]) as a transfer counter, and transfer the data externally from the RAM area specified by [RAM] using the D0 bus. forward. The transfer start address ([WA0]) and transfer word count counter ([TN0]) retain the values they had when the transfer started.
- JMP Imm
- Move to the address indicated by Imm (immediate).
- JMP Z,Imm
- When Z (zero flag) of the program control port is 1, move to the address indicated by Imm (immediate).
- JMP NZ,Imm
- When Z (zero flag) of the program control port is 0, move to the address indicated by Imm (immediate).
- JMP S,Imm
- When S (sign flag) of the program control port is 1, move to the address indicated by Imm (immediate).
- JMP NS,Imm
- When S (sign flag) of the program control port is 0, move to the address indicated by Imm (immediate).
- JMP C,Imm
- When C (carry flag) of the program control port is 1, it moves to the address indicated by Imm (immediate).
- JMP NC,Imm
- When C (carry flag) of the program control port is 0, move to the address indicated by Imm (immediate).
- JMP TO,Imm
- When TO (D0 bus DMA execution flag) of the program control port is 1, move to the address indicated by Imm (immediate).
- JMP NTO,Imm
- When TO (D0 bus DMA execution flag) of the program control port is 0, move to the address indicated by Imm (immediate).
- JMP ZS,Imm
- When either Z (zero flag) or S (sign flag) of the program control port is 1, move to the address indicated by Imm (immediate).
- JMP NZS,Imm
- When Z (zero flag) and S (sign flag) of the program control port are both 0, move to the address indicated by Imm (immediate).
- BTM
- When the loop counter ([LOP]) is other than 0, the top address register ([TOP]) is stored in the program counter and the loop counter ([LOP]) is decremented. When it is 0, it does nothing.
- LPS
- When the loop counter ([LOP]) is other than 0, stop the program counter, execute the next instruction, decrement the loop counter ([LOP]), and repeat until the loop counter reaches 0.
- END
- Stop the program and reset the EX (program execution control flag) of the program control port.
- ENDI
- Stop the program, reset EX (program execution control flag) of the program control port, and set E (program end interrupt flag).
●Description of DSP program
- For constants or assembler descriptions, please refer to the " SCU DSP Arambula User's Manual " in the appendix.
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★ HARDWARE Manual ★ SCU User's Manual
Copyright SEGA ENTERPRISES, LTD., 1997
