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CHAPTER 20 STANDBY FUNCTION
User’s Manual U15798EJ2V0UD
(2) HALT mode release
The HALT mode can be released with the following three types of sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the HALT mode is released. If interrupt acknowledgment
is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgment is disabled, the next
address instruction is executed.
Figure 20-2. HALT Mode Release by Interrupt Request Generation
HALT instruction
Wait
Wait
Operation mode
HALT mode
Operation mode
Oscillation
Clock
Standby release
signal
Interrupt request
Remarks 1.
The broken line indicates the case when the interrupt request which has released the standby
mode is acknowledged.
2.
Wait times are as follows:
• When vectored interrupt servicing is carried out:
8 or 9 clocks
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
(b) Release by non-maskable interrupt request
When a non-maskable interrupt request is generated, the HALT mode is released and vectored interrupt
servicing is carried out whether interrupt acknowledgment is enabled or disabled.
However, a non-maskable interrupt request is not generated during subsystem clock operation.
Содержание mPD780344 Series
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