Chapter 3. Instruction
(6) LYM
Naming :
Load Y-Register form Memory
Status :
Set
Format :
I
¡ ç
M(X,Y)
Function :
<Comment>
Y
Data from the RAM location addressed by the X-register and
Y-register is loaded into the Y-register. Data in the memory is
left unchanged.
(7) LAM
Naming :
Status :
Load Accumulator from Memory
Set
Format :
I
¡ ç
M(X,Y)
Function :
<Comment>
A
Data from the RAM location addressed by the X-register and
Y-register is loaded into the Y-register. Data in the memory is
left unchanged.
(8) XMA
Naming :
Status :
Format :
Exchanged Memory and Accumulator
Set
I
¡ ê
A
Function :
<Comment>
M(X,Y)
Data from the memory addressed by X-register and Y-register
is exchanged with data from the accumulator. For example,
this instruction is useful to fetch a memory word into the
accumulator for operation and store current data from the
accumulator into the RAM. The accumulator can be restored
by another XMA instruction.
(9) LYI i
Naming :
Status :
Load Y-Register from Immediate
Set
¥²
Format :
¡ Â ¡ Â
15
Operand :
Function :
<Purpose>
Constant 0
¡ ç
i
Y
i
To load a constant in Y-register. It is typically used to specify
Y-register in a particular RAM word address, to specify the
address of a selected output line, to set Y-register for
specifying a carrier signal outputted from OUT port, and to
initialize Y-register for loop control. The accumulator can be
restored by another XMA instruction.
<Comment>
Data of four bits from operand of instruction is transferred to
the Y-register.
3 - 7
HYNIX [ HYNIX SEMICONDUCTOR ]
