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LD pd,ps+IY     Load     Rabbit 4000 Instruction
Opcode
Instruction
Clocks
Operation
-- LD pd,ps+IY
4 (2,2)
 pd = ps + IY

6D 05

LD PW,PW+IY

4 (2,2)

PW = PW + IY

6D 15

LD PW,PX+IY

PW = PX + IY

6D 25

LD PW,PY+IY

PW = PY + IY

6D 35

LD PW,PZ+IY

PW = PZ + IY

6D 45

LD PX,PW+IY

4 (2,2)

PX = PW + IY

6D 55

LD PX,PX+IY

PX = PX + IY

6D 65

LD PX,PY+IY

PX = PY + IY

6D 75

LD PX,PZ+IY

PX = PZ + IY

6D 85

LD PY,PW+IY

4 (2,2)

PY = PW + IY

6D 95

LD PY,PX+IY

PY = PX + IY

6D A5

LD PY,PY+IY

PY = PY + IY

6D B5

LD PY,PZ+IY

PY = PZ + IY

6D C5

LD PZ,PW+IY

4 (2,2)

PZ = PW + IX

6D D5

LD PZ,PX+IY

PZ = PX + IX

6D E5

LD PZ,PY+IY

PZ = PY + IX

6D F5

LD PZ,PZ+IY

PZ = PZ + IX


Flags ALTD IOI/IOE
S
Z
L/V
C
F
R
SP
S
D
-
-
-
-
·

Description

Loads pd (any of the 32-bit registers PW, PX, PY or PZ) with the sum of ps (any of PW, PX, PY or PZ) and IY. These instructions cannot be used for general 32-bit arithmetic because the addition depends on the upper two bytes of ps. If the upper two bytes are all ones, then it is 16-bit addition. The following example illustrates this point: 


ld PW,0xFFFFFFFF
ld PW,PW+IY            ;yields PW=0xFFFF0000 if IY=1


ld PW,0x7FFFFFFF
ld PW,PW+IY            ;yields PW=0x80000000 if IY=1
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