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UPD784938 Datasheet(PDF) 21 Page - NEC |
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UPD784938 Datasheet(HTML) 21 Page - NEC |
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21 / 733 page  21 Preliminary User’s Manual U13987EJ1V0UM00 24.2.1 Wait function control registers ..................................................................................................... 615 24.2.2 Address waits ............................................................................................................................... 618 24.2.3 Access waits ................................................................................................................................. 621 24.3 Pseudo-Static RAM Refresh Function .................................................................................. 628 24.3.1 Control registers ........................................................................................................................... 629 24.3.2 Operations .................................................................................................................................... 630 24.4 Bus Hold Function ................................................................................................................... 634 24.4.1 Hold mode register (HLDM) ........................................................................................................ 634 24.4.2 Operation ...................................................................................................................................... 635 24.5 Cautions .................................................................................................................................... 636 CHAPTER 25 STANDBY FUNCTION .................................................................................................... 637 25.1 Configuration and Function ................................................................................................... 637 25.2 Control Registers ..................................................................................................................... 639 25.2.1 Standby control register (STBC) ................................................................................................. 639 25.2.2 Oscillation stabilization time specification register (OSTS) ....................................................... 641 25.3 HALT Mode ................................................................................................................................ 642 25.3.1 HALT mode setting and operating status .................................................................................... 642 25.3.2 HALT mode release ..................................................................................................................... 642 25.4 STOP Mode ............................................................................................................................... 646 25.4.1 STOP mode setting and operating status ................................................................................... 646 25.4.2 STOP mode release .................................................................................................................... 647 25.5 IDLE Mode ................................................................................................................................. 650 25.5.1 IDLE mode setting and operating status .................................................................................... 650 25.5.2 IDLE mode release ...................................................................................................................... 651 25.6 Check Items when STOP Mode/IDLE Mode is Used ........................................................... 653 25.7 Cautions .................................................................................................................................... 655 CHAPTER 26 RESET FUNCTION ......................................................................................................... 657 26.1 Reset Function ......................................................................................................................... 657 26.2 Caution ...................................................................................................................................... 662 CHAPTER 27 ROM CORRECTION ....................................................................................................... 663 27.1 ROM Correction Functions ..................................................................................................... 663 27.2 ROM Correction Configuration .............................................................................................. 665 27.3 Control Register for ROM Correction ................................................................................... 667 27.4 Use of ROM Correction ........................................................................................................... 669 27.5 Conditions for Executing ROM Correction .......................................................................... 670 CHAPTER 28 µPD78F4938 PROGRAMMING ...................................................................................... 671 28.1 Internal Memory Size Switching Register (IMS) .................................................................. 672 28.2 Flash Memory Programming Using Flashpro II and Flashpro III ...................................... 673 28.2.1 Selecting communication mode .................................................................................................. 673 28.2.2 Flash memory programming functions ........................................................................................ 674 28.2.3 Connecting Flashpro II or Flashpro III ........................................................................................ 675 CHAPTER 29 INSTRUCTION OPERATIONS ....................................................................................... 677 29.1 Conventions ............................................................................................................................. 677 |
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