140
Rabbit 2000/3000 Microprocessor
Description
Arithmetically shifts to the right the bits in the data whose address is
•
the data in HL, or
•
the sum of the data in IX and a displacement d, or
•
the sum of the data in IY and a displacement d.
Bits 7 through 1 are shifted to the next lowest-order bit position (bit 7 is shifted to bit 6, etc.). Bit 7 is also cop-
ied to itself. Bit 0 is shifted to the C flag. See figure below.
Figure 8: The bit logic of the SRA instruction.
SRA (HL)
SRA (IX+
d
)
SRA (IY+
d
)
Opcode
Instruction
Clocks
Operation
CB 2E
SRA (HL)
10*
(HL) = {(HL)[7],(HL)[7,1]};
CF = (HL)[0]
DD CB
d
2E
SRA (IX+
d
)
13**
(IX +
d
) = {(IX +
d
)[7],(IX +
d
)[7,1]};
CF = (IX +
d
)[0]
FD CB
d
2E
SRA (IY+
d
)
13**
(IY +
d
) = {(IY +
d
)[7],(IY +
d
)[7,1]};
CF = (IY +
d
)[0]
Clocking: *10 (2,2,1,2,3) **13 (2,2,2,2,2,3)
Flags
ALTD
I/O
S
Z
L/V
C
F
R
SP
S
D
•
•
L
•
•
•
•
7
0
CF
Summary of Contents for 2000
Page 2: ...ii Rabbit 2000 3000 Microprocessor...
Page 4: ...iv Rabbit 2000 Microprocessor...
Page 16: ...12 Rabbit 2000 3000 Microprocessor...
Page 164: ...160 Instruction Reference Manual...
