NEC 78K0 User Manual page 338

(2) HALT mode release
The HALT mode can be released by the following two 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 17-3. HALT Mode Release by Interrupt Request Generation
Standby
release signal
Status of CPU
X1 input clock,
Ring-OSC clock,
or subsystem clock
Remarks 1. The broken lines indicate the case when the interrupt request which has released the standby
mode is acknowledged.
2. The wait time is 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
338
CHAPTER 17 STANDBY FUNCTION
Interrupt
HALT
instruction
Operating mode HALT mode
User's Manual U16227EJ2V0UD
request
Wait
Wait
Oscillation
Operating mode