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Transfer Control Instructions 5-25
Miscellaneous Notes:
• Substitute the desired register name or address for “RegA” in the syntax examples.
• data8 indicates eight bits of data.
• Use SFBR instead of data8 to add two register values.
5.6 Transfer Control Instructions
This section describes the Transfer Control Instructions. The
configuration of the OpCode bits define which Transfer Control Instruction
to perform.
100 AND data with register and
place the result in the same
register. Syntax: “Move
RegA & data8 to RegA”
ANDdatawithregisterand
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA & data8 to SFBR”
ANDdatawithSFBRand
place the result in the
register. Syntax: “Move
SFBR & data8 to RegA”
101
1
Shift register one bit to the
right and place the result in
the same register. Syntax:
“Move RegA SHR RegA”
Shift register one bit to the
right and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA SHR
SFBR”
Shift the SFBR register one
bit to the right and place the
result in the register. Syntax:
“Move SFBR SHR RegA”
110 Add data to register without
carry and place the result
in the same register.
Syntax: “Move RegA +
data8toRegA”
Add data to register without
carry and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR”
AdddatatoSFBRwithout
carry and place the result in
the register. Syntax: “Move
SFBR + data8 to RegA”
111 Add data to register with
carry and place the result
in the same register.
Syntax: “Move RegA +
data8 to RegA with carry”
Adddatatoregisterwith
carry and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR with carry”
AdddatatoSFBRwithcarry
andplacetheresultinthe
register. Syntax: “Move
SFBR + data8 to RegA with
carry”
1. Data is shifted through the Carry bit and the Carry bit is shifted into the data byte.
Table 5.3 Read/Write Instructions (Cont.)
Operator
OpCode 111
Read-Modify-Write
OpCode 110
Move to SFBR
OpCode 101
Move from SFBR