CHAPTER 16 STANDBY FUNCTION
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(2) Releasing HALT mode
The HALT mode can be released by the following three types of sources:
(a) Releasing by unmasked interrupt request
The HALT mode is released by an unmasked interrupt request. In this case, if the interrupt request is
able to be acknowledged, vectored interrupt processing is performed. If the interrupt is disabled, the
instruction at the next address is executed.
Figure 16-2. Releasing HALT Mode by Interrupt
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 processing is performed:
9 to 10 clocks
•
When vectored interrupt processing is not performed: 1 to 2 clocks
(b) Releasing by non-maskable interrupt request
The HALT mode is released regardless of whether the interrupt is enabled or disabled, and vectored
interrupt processing is performed.
HALT
instruction
Standby
release signal
Wait
Wait
HALT mode
Operating
mode
Operating mode
Clock
Oscillation
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