Transfer Control Instructions - LSI LSI53C875A Technical Manual

Table 5.3 Read/Write Instructions (Cont.)
OpCode 111
Operator Read-Modify-Write
100 AND data with register and
place the result in the same
register. Syntax: "Move
RegA & data8 to RegA"
1
101 Shift register one bit to the
right and place the result in
the same register. Syntax:
"Move RegA SHR RegA"
110 Add data to register without
carry and place the result
in the same register.
Syntax: "Move RegA +
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"
1. Data is shifted through the Carry bit and the Carry bit is shifted into the data byte.
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

OpCode 110
Move to SFBR
AND data with register and
place the result in the
First Byte Received (SFBR)
register. Syntax: "Move
RegA & data8 to SFBR"
Shift register one bit to the
right and place the result in
the
Received (SFBR)
Syntax: "Move RegA SHR
SFBR"
Add data to register without
carry and place the result in
the
Received (SFBR)
Syntax: "Move RegA + data8
to SFBR"
Add data to register with
carry and place the result in
the
Received (SFBR)
Syntax: "Move RegA + data8
to SFBR with carry"
This section describes the Transfer Control Instructions. The
configuration of the OpCode bits define which Transfer Control Instruction
to perform.
Transfer Control Instructions
SCSI
SCSI First Byte
register.
SCSI First Byte
register.
SCSI First Byte
register.
OpCode 101
Move from SFBR
AND data with SFBR and
place the result in the
register. Syntax: "Move
SFBR & data8 to RegA"
Shift the SFBR register one
bit to the right and place the
result in the register. Syntax:
"Move SFBR SHR RegA"
Add data to SFBR without
carry and place the result in
the register. Syntax: "Move
SFBR + data8 to RegA"
Add data to SFBR with carry
and place the result in the
register. Syntax: "Move
SFBR + data8 to RegA with
carry"
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