GMS34004 Datasheet, PDF (35/105 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 3. Instruction
(10) LMIIY i
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(11) LXI n
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(12) SEM n
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(13) REM n
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Load Memory from Immediate and Increment Y-Register
Set
¥²
Constant 0 ¡Â i ¡Â 15
M(X,Y) ¡ç i, Y ¡ç Y + 1
Data of four bits from operand of instruction is stored into the
RAM location addressed by the X-register and Y-register.
Then data in the Y-register is incremented by one.
Load X-Register from Immediate
Set
¥±
X file address 0 ¡Â n ¡Â 3
X ¡ç n
A constant is loaded in X-register. It is used to set X-register in
an index of desired RAM page. Operand of 1 bit of command
is loaded in X-register.
Set Memory Bit
Set
¥±
Bit address 0 ¡Â n ¡Â 3
M(X,Y,n) ¡ç 1
Depending on the selection in operand of operand, one of four
bits is set as logic 1 in the RAM memory addressed in
accordance with the data of the X-register and Y-register.
Reset Memory Bit
Set
¥±
Bit address 0 ¡Â n ¡Â 3
M(X,Y,n) ¡ç 0
Depending on the selection in operand of operand, one of four
bits is set as logic 0 in the RAM memory addressed in
accordance with the data of the X-register and Y-register.
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