NEC mPD780065 Series Preliminary User's Manual page 296

(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
Standby release
signal
Operation mode
Clock
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:
• 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.
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CHAPTER 19 STANDBY FUNCTION
Interrupt request
HALT instruction
HALT mode
Oscillation
Preliminary User's Manual U13420EJ2V0UM00
Wait
Wait Operation mode
8 or 9 clocks