Avago Technologies LSI53C895A - Manual (Page 247)

Read/Write 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.
100 AND data with register and
place the result in the same
register. Syntax: “Move
RegA & data8 to RegA” AND data with register and
place the result in the
SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA & data8 to SFBR”
AND data with SFBR and
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 +
data8 to RegA” Add data to register without
carry and place the result in
the
SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR”
Add data to SFBR without
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” Add data to register with
carry and place the result in
the
SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR with carry”
Add data to SFBR with carry
and place the result in the
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