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CHAPTER 19 STANDBY FUNCTION
Preliminary User’s Manual U13420EJ2V0UM00
(2) HALT mode clear
The HALT mode can be cleared with the following three types of sources.
(a) Clear upon unmasked interrupt request
When an unmasked interrupt request is generated, the HALT mode is cleared. If interrupt acknowledge is
enabled, vectored interrupt service is carried out. If interrupt acknowledge is disabled, the next address
instruction is executed.
Figure 19-2. HALT Mode Clear Upon 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 cleared the standby
mode is acknowledged.
2. Wait times are as follows:
• When vectored interrupt service is carried out:
8 or 9 clocks
• When vectored interrupt service is not carried out: 2 or 3 clocks
(b) Clear upon non-maskable interrupt request
When an non-maskable interrupt request is generated, the HALT mode is cleared and vectored interrupt
service is carried out whether interrupt acknowledge is enabled or disabled.
Содержание mPD780065 Series
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