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Individual Instruction Descriptions
4-173
Assembly Language Instructions
4.14.78 STAG Set Tag
Syntax
[label] name dest
Clock,
clk
Word,
w
With RPT,
clk
Class
STAG {
adrs
} Table 4–46 Table 4–46 5
Execution memory tag bit at address adrs
⇐ 1
PC ⇐ PC +
w
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
STAG {
adrs
}
1 1 0 1 0 1 1 0 0
adrs
x
dma16
(for direct) or
offset16
(long relative) [see section 4.13]
Description Sets the tag bit at the addressed memory location. All addressing modes are
available. Note that this instruction accesses only the 17
th
bit of the RAM
location. The argument, {
adrs
}, is interpreted as bytes. For odd RAM byte
addresses, the least significant bit is ignored.
See Also RTAG, RFLAG, SFLAG
Example 4.14.78.1 STAG *R2+R5
Set TAG bit of the word in RAM byte address, R2 + R5. R2 and R5 remain unchanged.
Example 4.14.78.2 STAG *0x200 * 2
Set TAG bit of RAM word 0x200 (RAM byte address 0x400).
Example 4.14.78.3 STAG *0x401
Set TAG bit of RAM word 0x200 (RAM byte address 0x400).