18.4.1 3-wire serial I/O mode.................................................................................................................. 506
18.4.2 3-wire serial I/O mode with automatic transmit/receive function .................................................. 510
CHAPTER 19 I2C BUS.......................................................................................................................... 526
19.1 Features .................................................................................................................................... 526
19.2 Configuration............................................................................................................................ 529
19.3 Registers................................................................................................................................... 531
19.4 Functions .................................................................................................................................. 544
19.4.1 Pin configuration.......................................................................................................................... 544
19.5 I2C Bus Definitions and Control Methods .............................................................................. 545
19.5.1 Start condition.............................................................................................................................. 545
19.5.2 Addresses.................................................................................................................................... 546
19.5.3 Transfer direction specification .................................................................................................... 546
19.5.4 Acknowledge signal (ACK) .......................................................................................................... 547
19.5.5 Stop condition.............................................................................................................................. 548
19.5.6 Wait signal (WAIT)....................................................................................................................... 549
19.6 I2C Interrupt Request Signal (INTIIC0).................................................................................... 551
19.6.1 Master device operation............................................................................................................... 551
19.6.2 Slave device operation (when receiving slave address data (match with address)) .................... 554
19.6.3 Slave device operation (when receiving extension code) ............................................................ 558
19.6.4 Operation without communication................................................................................................ 562
19.6.5 Arbitration loss operation (operation as slave after arbitration loss) ............................................ 562
19.6.6 Operation when arbitration loss occurs (no communication after arbitration loss)....................... 564
19.7 Interrupt Request Signal (INTIIC0) Generation Timing and Wait Control........................... 569
19.8 Address Match Detection Method .......................................................................................... 570
19.9 Error Detection ......................................................................................................................... 570
19.10 Extension Code ........................................................................................................................ 570
19.11 Arbitration................................................................................................................................. 571
19.12 Wakeup Function ..................................................................................................................... 572
19.13 Communication Reservation .................................................................................................. 573
19.13.1 When communication reservation function is enabled (IICF0.IICRSV0 bit = 0)........................... 573
19.13.2 When communication reservation function is disabled (IICF0.IICRSV0 bit = 1) .......................... 576
19.14 Cautions.................................................................................................................................... 577
19.15 Communication Operations.................................................................................................... 577
19.15.1 Master operation 1....................................................................................................................... 577
19.15.2 Master operation 2....................................................................................................................... 579
19.15.3 Slave operation............................................................................................................................ 580
19.16 Timing of Data Communication.............................................................................................. 583
CHAPTER 20 INTERRUPT/EXCEPTION PROCESSING FUNCTION............................................... 590
20.1 Overview ................................................................................................................................... 590
20.1.1 Features....................................................................................................................................... 590
20.2 Non-Maskable Interrupts......................................................................................................... 593
20.2.1 Operation..................................................................................................................................... 596
20.2.2 Restore ........................................................................................................................................ 597
20.2.3 NP flag......................................................................................................................................... 598
20.3 Maskable Interrupts ................................................................................................................. 599
20.3.1 Operation..................................................................................................................................... 599
14
User’s Manual U16890EJ1V0UD
NEC [ NEC ]
