19.2.4 Noise elimination for NMI pin........................................................................................................619
19.2.5 Edge detection function for NMI pin..............................................................................................620
19.3 Maskable Interrupts..................................................................................................................622
19.3.1 Operation......................................................................................................................................622
19.3.2 Restore.........................................................................................................................................624
19.3.3 Priorities of maskable interrupts ...................................................................................................625
19.3.4 Interrupt control register (xxlCn) ...................................................................................................629
19.3.5 Interrupt mask registers 0 to 2 (IMR0 to IMR2).............................................................................634
19.3.6 In-service priority register (ISPR)..................................................................................................637
19.3.7 Maskable interrupt status flag.......................................................................................................638
19.3.8 Watchdog timer mode register 1 (WDTM1)..................................................................................639
19.3.9 Elimination of noise from INTP0 to INTP6....................................................................................639
19.3.10 INTP0 to INTP6 edge detection function ......................................................................................640
19.4 Software Exceptions.................................................................................................................643
19.4.1 Operation......................................................................................................................................643
19.4.2 Restore.........................................................................................................................................644
19.4.3 Exception status flag (EP) ............................................................................................................645
19.5 Exception Trap ..........................................................................................................................646
19.5.1 Illegal op code ..............................................................................................................................646
19.5.2 Debug trap....................................................................................................................................648
19.6 Multiple Interrupt Servicing Control........................................................................................650
19.7 Interrupt Response Time..........................................................................................................652
19.8 Periods in Which Interrupts Are Not Acknowledged by CPU ..............................................653
CHAPTER 20 KEY INTERRUPT FUNCTION ......................................................................................654
20.1 Function.....................................................................................................................................654
20.2 Key Interrupt Control Register ................................................................................................655
CHAPTER 21 STANDBY FUNCTION...................................................................................................656
21.1 Overview ....................................................................................................................................656
21.2 HALT Mode ................................................................................................................................659
21.2.1 Setting and operation status.........................................................................................................659
21.2.2 Releasing HALT mode .................................................................................................................659
21.3 IDLE Mode..................................................................................................................................661
21.3.1 Setting and operation status.........................................................................................................661
21.3.2 Releasing IDLE mode...................................................................................................................661
21.4 STOP Mode...................................................................................................................................663
21.4.1 Setting and operation status.........................................................................................................663
21.4.2 Releasing STOP mode.................................................................................................................663
21.5 Securing Oscillation Stabilization Time .................................................................................665
21.6 Subclock Operation Mode........................................................................................................666
21.6.1 Setting and operation status.........................................................................................................666
21.6.2 Releasing subclock operation mode.............................................................................................666
21.7 Sub-IDLE Mode..........................................................................................................................668
21.7.1 Setting and operation status.........................................................................................................668
21.7.2 Releasing sub-IDLE mode............................................................................................................668
21.8 Control Registers......................................................................................................................670
CHAPTER 22 RESET FUNCTION ........................................................................................................671
17
User’s Manual U15862EJ3V0UD
NEC [ NEC ]
