Sleep (Sleep) - Renesas H8/300 Series Programming Manual

SLEEP (SLEEP)

<Operation>
Program execution state → power-
down mode
<Assembly-Language Format>
SLEEP
<Examples>
SLEEP
<Operand Size>
—
<Description>
When the SLEEP instruction is executed, the CPU enters a power-down mode. Its internal
state remains unchanged, but the CPU stops executing instructions and waits for an exception-
handling request (interrupt or reset). When it receives an exception-handling request, the CPU
exits the power-down mode and begins the exception-handling sequence.
If the interrupt mask (I) bit is set to "1," the power-down mode can be released only by a
nonmaskable interrupt (NMI) or reset.
For information about the power-down modes, see the Hardware Manual for the particular
chip.
<Instruction Formats>
Addressing
mode
Mnem. Operands
SLEEP
<Condition Code
I
— — — — — — — —
I: Previous value remains unchanged.
H: Previous value remains unchanged.
N: Previous value remains unchanged.
Z: Previous value remains unchanged.
V: Previous value remains unchanged.
C: Previous value remains unchanged.
Instruction code
1st byte 2nd byte
0 1 8 0
108
SLEEP
H N Z
3rd byte 4th byte
V C
No. of
states
2