NEC 78K0S/KA1+ Preliminary User's Manual page 230

www.DataSheet4U.com
(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
acknowledgement is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgement is
disabled, the next address instruction is executed.
www.DataSheet4U.com
release signal
Status of CPU
System clock
Remarks 1. The broken lines indicate the case when the interrupt request which has released the
230
CHAPTER 13 STANDBY FUNCTION
Figure 13-2. HALT Mode Release by Interrupt Request Generation
HALT
instruction
Standby
Operating mode
oscillation
standby mode is acknowledged.
2. The wait time is as follows:
• When vectored interrupt servicing is carried out: 9 or 10 clocks
• When vectored interrupt servicing is not carried out: 1 or 2 clocks
Preliminary User's Manual U16898EJ1V0UD
Interrupt
request
Wait
HALT mode Wait
Oscillation
Operating mode