Datasheet

Rev. 2.00 Sep. 28, 2009 Page xv of xl
REJ09B0429-0200
12.6 Usage Notes ....................................................................................................................... 323
12.6.1 Notes on Register Access...................................................................................... 323
12.6.2 Conflict between Timer Counter (TCNT) Write and Increment........................... 324
12.6.3 Changing Values of CKS2 to CKS0 Bits.............................................................. 324
12.6.4 Changing Value of PSS Bit................................................................................... 324
12.6.5 Switching between Watchdog Timer Mode and Interval Timer Mode................. 325
12.6.6 System Reset by RESO Signal.............................................................................. 325
Section 13 Serial Communication Interface (SCI) ............................................327
13.1 Features.............................................................................................................................. 327
13.2 Input/Output Pins............................................................................................................... 330
13.3 Register Descriptions ......................................................................................................... 330
13.3.1 Receive Shift Register (RSR) ............................................................................... 331
13.3.2 Receive Data Register (RDR) ............................................................................... 331
13.3.3 Transmit Data Register (TDR).............................................................................. 331
13.3.4 Transmit Shift Register (TSR) .............................................................................. 331
13.3.5 Serial Mode Register (SMR) ................................................................................ 332
13.3.6 Serial Control Register (SCR)............................................................................... 335
13.3.7 Serial Status Register (SSR) ................................................................................. 338
13.3.8 Smart Card Mode Register (SCMR)..................................................................... 342
13.3.9 Bit Rate Register (BRR) ....................................................................................... 343
13.4 Operation in Asynchronous Mode ..................................................................................... 347
13.4.1 Data Transfer Format............................................................................................ 348
13.4.2 Receive Data Sampling Timing and Reception Margin in
Asynchronous Mode............................................................................................. 349
13.4.3 Clock..................................................................................................................... 350
13.4.4 SCI Initialization (Asynchronous Mode).............................................................. 351
13.4.5 Serial Data Transmission (Asynchronous Mode) ................................................. 352
13.4.6 Serial Data Reception (Asynchronous Mode)....................................................... 354
13.5 Multiprocessor Communication Function.......................................................................... 358
13.5.1 Multiprocessor Serial Data Transmission ............................................................. 360
13.5.2 Multiprocessor Serial Data Reception .................................................................. 361
13.6 Operation in Clock Synchronous Mode............................................................................. 365
13.6.1 Clock..................................................................................................................... 365
13.6.2 SCI Initialization (Clock Synchronous Mode)...................................................... 366
13.6.3 Serial Data Transmission (Clock Synchronous Mode)......................................... 367
13.6.4 Serial Data Reception (Clock Synchronous Mode) .............................................. 370
13.6.5 Simultaneous Serial Data Transmission and Reception
(Clock Synchronous Mode) .................................................................................. 372
13.7 Smart Card Interface Description....................................................................................... 374