
User’s Manual U17553EJ4V0UD
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CHAPTER 19 RESET FUNCTION........................................................................................................ 552
19.1 Register for Confirming Reset Source ................................................................................... 560
CHAPTER 20 MULTIPLIER/DIVIDER ................................................................................................... 561
20.1 Functions of Multiplier/Divider................................................................................................ 561
20.2 Configuration of Multiplier/Divider ......................................................................................... 561
20.3 Register Controlling Multiplier/Divider .................................................................................. 565
20.4 Operations of Multiplier/Divider.............................................................................................. 566
20.4.1 Multiplication operation...................................................................................................................566
20.4.2 Division operation...........................................................................................................................568
CHAPTER 21 POWER-ON-CLEAR CIRCUIT...................................................................................... 570
21.1 Functions of Power-on-Clear Circuit...................................................................................... 570
21.2 Configuration of Power-on-Clear Circuit ............................................................................... 571
21.3 Operation of Power-on-Clear Circuit ...................................................................................... 571
21.4 Cautions for Power-on-Clear Circuit ...................................................................................... 574
CHAPTER 22 LOW-VOLTAGE DETECTOR ....................................................................................... 576
22.1 Functions of Low-Voltage Detector........................................................................................ 576
22.2 Configuration of Low-Voltage Detector ................................................................................. 577
22.3 Registers Controlling Low-Voltage Detector......................................................................... 577
22.4 Operation of Low-Voltage Detector ........................................................................................ 580
22.4.1 When used as reset .......................................................................................................................581
22.4.2 When used as interrupt ..................................................................................................................586
22.5 Cautions for Low-Voltage Detector ........................................................................................ 591
CHAPTER 23 OPTION BYTE............................................................................................................... 594
23.1 Functions of Option Bytes ...................................................................................................... 594
23.2 Format of Option Byte ............................................................................................................. 596
CHAPTER 24 FLASH MEMORY .......................................................................................................... 599
24.1 Internal Memory Size Switching Register.............................................................................. 599
24.2 Internal Expansion RAM Size Switching Register ................................................................ 600
24.3 Writing with Flash Memory Programmer ............................................................................... 601
24.4 Programming Environment ..................................................................................................... 604
24.5 Communication Mode .............................................................................................................. 604
24.6 Connection of Pins on Board.................................................................................................. 606
24.6.1 FLMD0 pin......................................................................................................................................606
24.6.2 Serial interface pins........................................................................................................................606
24.6.3 RESET pin......................................................................................................................................608
24.6.4 Port pins .........................................................................................................................................608
24.6.5 REGC pin .......................................................................................................................................608
24.6.6 Other signal pins ............................................................................................................................608
24.6.7 Power supply..................................................................................................................................609
24.7 Programming Method .............................................................................................................. 610
24.7.1 Controlling flash memory................................................................................................................610
24.7.2 Flash memory programming mode.................................................................................................610