SH7144 Datasheet, PDF (18/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

12.6.4 Changing between Watchdog Timer/Interval Timer Modes................................ 359
12.6.5 System Reset by WDTOVF Signal...................................................................... 360
12.6.6 Internal Reset in Watchdog Timer Mode............................................................. 360
12.6.7 Manual Reset in Watchdog Timer Mode ............................................................. 360
Section 13 Serial Communication Interface (SCI) ............................................361
13.1 Features............................................................................................................................. 361
13.2 Input/Output Pins .............................................................................................................. 363
13.3 Register Descriptions ........................................................................................................ 363
13.3.1 Receive Shift Register (RSR) .............................................................................. 365
13.3.2 Receive Data Register (RDR) .............................................................................. 365
13.3.3 Transmit Shift Register (TSR) ............................................................................. 365
13.3.4 Transmit Data Register (TDR)............................................................................. 365
13.3.5 Serial Mode Register (SMR)................................................................................ 366
13.3.6 Serial Control Register (SCR).............................................................................. 367
13.3.7 Serial Status Register (SSR) ................................................................................ 369
13.3.8 Serial Direction Control Register (SDCR)........................................................... 372
13.3.9 Bit Rate Register (BRR) ...................................................................................... 373
13.4 Operation in Asynchronous Mode .................................................................................... 381
13.4.1 Data Transfer Format........................................................................................... 382
13.4.2 Receive Data Sampling Timing and Reception Margin
in Asynchronous Mode ........................................................................................ 383
13.4.3 Clock.................................................................................................................... 384
13.4.4 SCI initialization (Asynchronous mode).............................................................. 385
13.4.5 Data transmission (Asynchronous mode) ............................................................ 386
13.4.6 Serial data reception (Asynchronous mode) ........................................................ 388
13.5 Multiprocessor Communication Function......................................................................... 392
13.5.1 Multiprocessor Serial Data Transmission ............................................................ 394
13.5.2 Multiprocessor Serial Data Reception ................................................................. 395
13.6 Operation in Clocked Synchronous Mode ........................................................................ 398
13.6.1 Clock.................................................................................................................... 398
13.6.2 SCI initialization (Clocked Synchronous mode).................................................. 398
13.6.3 Serial data transmission (Clocked Synchronous mode) ....................................... 400
13.6.4 Serial data reception (Clocked Synchronous mode) ............................................ 402
13.6.5 Simultaneous Serial Data Transmission and Reception
(Clocked Synchronous mode) .............................................................................. 404
13.7 Interrupt Sources............................................................................................................... 406
13.7.1 Interrupts in Normal Serial Communication Interface Mode .............................. 406
13.8 Usage Notes ...................................................................................................................... 408
13.8.1 TDR Write and TDRE Flag ................................................................................. 408
13.8.2 Module Standby Mode Setting ............................................................................ 408
13.8.3 Break Detection and Processing (Asynchronous Mode Only)............................. 408
13.8.4 Sending a Break Signal (Asynchronous Mode Only) .......................................... 408
Rev. 2.0, 09/02, page xvi of xxxviii