
Preliminary User’s Manual U19111EJ2V1UD
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16.4.2 3-wire serial I/O mode ..................................................................................................................538
CHAPTER 17 INTERRUPT FUNCTIONS ............................................................................................ 551
17.1 Interrupt Function Types ......................................................................................................... 551
17.2 Interrupt Sources and Configuration ..................................................................................... 551
17.3 Registers Controlling Interrupt Functions............................................................................. 556
17.4 Interrupt Servicing Operations ............................................................................................... 581
17.4.1 Maskable interrupt acknowledgment............................................................................................581
17.4.2 Software interrupt request acknowledgment ................................................................................583
17.4.3 Multiple interrupt servicing ...........................................................................................................584
17.4.4 Interrupt request hold ...................................................................................................................587
CHAPTER 18 KEY INTERRUPT FUNCTION ..................................................................................... 588
18.1 Functions of Key Interrupt ...................................................................................................... 588
18.2 Configuration of Key Interrupt ................................................................................................ 589
18.3 Register Controlling Key Interrupt ......................................................................................... 590
CHAPTER 19 STANDBY FUNCTION .................................................................................................. 591
19.1 Standby Function and Configuration ..................................................................................... 591
19.1.1 Standby function ..........................................................................................................................591
19.1.2 Registers controlling standby function..........................................................................................592
19.2 Standby Function Operation ................................................................................................... 594
19.2.1 HALT mode ..................................................................................................................................594
19.2.2 STOP mode .................................................................................................................................599
CHAPTER 20 RESET FUNCTION........................................................................................................ 606
20.1 Register for Confirming Reset Source ................................................................................... 615
CHAPTER 21 POWER-ON-CLEAR CIRCUIT...................................................................................... 616
21.1 Functions of Power-on-Clear Circuit...................................................................................... 616
21.2 Configuration of Power-on-Clear Circuit ............................................................................... 617
21.3 Operation of Power-on-Clear Circuit ...................................................................................... 617
21.4 Cautions for Power-on-Clear Circuit ...................................................................................... 620
CHAPTER 22 LOW-VOLTAGE DETECTOR ....................................................................................... 622
22.1 Functions of Low-Voltage Detector........................................................................................ 622
22.2 Configuration of Low-Voltage Detector ................................................................................. 623
22.3 Registers Controlling Low-Voltage Detector......................................................................... 623
22.4 Operation of Low-Voltage Detector ........................................................................................ 627
22.4.1 When used as reset .....................................................................................................................629
22.4.2 When used as interrupt ................................................................................................................635
22.5 Cautions for Low-Voltage Detector ........................................................................................ 641
CHAPTER 23 REGULATOR ................................................................................................................. 644
23.1 Regulator Overview.................................................................................................................. 644