Releasing Halt Mode By Interrupt - NEC switch User Manual

(2) Releasing HALT mode
The HALT mode can be released by the following three sources.
(a) Releasing by unmasked interrupt request
The HALT mode is released by an unmasked interrupt request. In this case, if interrupts are enabled to be
acknowledged, vectored interrupt servicing is performed. If interrupts are disabled, the instruction at the
next address is executed.
Standby
release signal
Clock
Remarks 1. The broken lines indicate the case where the interrupt request that has released the
standby mode is acknowledged.
2. The wait time is as follows.
• When vectored interrupt servicing is performed:
• When vectored interrupt servicing is not performed: 1 to 2 clocks
(b) Releasing by non-maskable interrupt request
The HALT mode is released regardless of whether interrupts are enabled or disabled, and vectored
interrupt servicing is performed.
CHAPTER 12
Figure 12-2. Releasing HALT Mode by Interrupt
HALT
instruction
Operation
HALT mode
mode
User's Manual U12978EJ3V0UD
STANDBY FUNCTION
Wait
Wait
Oscillation
9 to 10 clocks
Operation mode
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