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NO OPERATION instruction
Coding:
(symbol "." shows, that this digit can have any value)
Description:
Nothing will be done. This instruction is often used to replace
unwanted command in a program.
Examples:
0000\
E0EA/ |
both commands only "fills place" in a program and
do nothing |
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HALT instruction
Coding:
(sumbol "." shows, that this digit can have any value)
Description:
This instruction stops program executions
Examples:
0F00\
EF97/ |
both commands finish the execution of the program |
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MOVE instruction
Coding:
(MOD - modifier: affects on operands type - word/byte, or maybe
specifies "short constant" (see examples); OP1 and OP2 - operands)
Description:
OP1 ==> OP2
This instruction gets OP1 and puts it into OP2. Flags N and Z are
set according to the operand.
Examples:
0120 |
R2 ==> R0 |
the value of the word from R2 will be copied to R0 |
C120 |
R2b ==> R0b |
the value of the low byte from R2 will be copied to R0 |
8120 |
R2b ==> R0 |
the value of the low byte from R2 will be copied to R0;
the high byte of R0 will be 00 in the case R2b<80
and FF otherwise (arithmetic sign extension) |
0141 |
(R0) ==> R1 |
the value from memory, which address is stored in register R0, will be copied to R1 |
01D2
0080 |
80 ==> R2 |
constant 80, arranged in the next word of memory, will be copied to R2 |
C1D2
0030 |
30b ==> R2b |
byte value 30, arranged in the next word of memory, will replace low byte of R2 |
2113 |
1 ==> R3 |
"short constant" 1 (OP1 number is a constant itself!) will be copied to R3. Modifier=2 for positive numbers |
3123 |
2 ==> R3 |
"short constant" -2 will be copied to R3. Modifier=3 for negative numbers |
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