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HLT
HALT
HLT
Operation:
None
Description:
HLT (Halt) causes the CPU to enter the halt
state. The processor leaves the halt state upon
activation
of
the RESET line, upon receipt of a
non-maskable interrupt request on NMI, or,
if
interrupts are enabled, upon receipt
of
a mask-
Encoding:
11110100
Flags Affected:
None
able interrupt request on INTR. HLT does not
affect any flags.
It
may be used as an alterna-
tive to an endless software loop
in
situations
where a program must wait for an interrupt.
HL T Operands
Clocks
Transfers Bytes
HLT Coding
Example
(no operands)
2
-
1
HLT
2-76