Renesas H8S/2437 Hardware Manual page 18

Section 16 Serial Communication Interface (SCI) ............................................425
16.1 Features............................................................................................................................. 425
16.2 Input/Output Pins .............................................................................................................. 427
16.3 Register Descriptions ........................................................................................................ 428
16.3.1 Receive Shift Register (RSR) .............................................................................. 428
16.3.2 Receive Data Register (RDR) .............................................................................. 428
16.3.3 Transmit Data Register (TDR)............................................................................. 428
16.3.4 Transmit Shift Register (TSR) ............................................................................. 429
16.3.5 Serial Mode Register (SMR) ............................................................................... 429
16.3.6 Serial Control Register (SCR).............................................................................. 431
16.3.7 Serial Status Register (SSR) ................................................................................ 433
16.3.8 Serial Interface Mode Register (SCMR).............................................................. 435
16.3.9 Bit Rate Register (BRR) ...................................................................................... 436
16.4 Operation in Asynchronous Mode .................................................................................... 442
16.4.1 Data Transfer Format........................................................................................... 443
16.4.2 Receive Data Sampling Timing and Reception Margin in Asynchronous
Mode.................................................................................................................... 444
16.4.3 Clock.................................................................................................................... 445
16.4.4 SCI Initialization (Asynchronous Mode) ............................................................. 446
16.4.5 Serial Data Transmission (Asynchronous Mode) ................................................ 447
16.4.6 Serial Data Reception (Asynchronous Mode)...................................................... 449
16.5 Multiprocessor Communication Function......................................................................... 453
16.5.1 Multiprocessor Serial Data Transmission ............................................................ 455
16.5.2 Multiprocessor Serial Data Reception ................................................................. 456
16.6 Operation in Clocked Synchronous Mode ........................................................................ 459
16.6.1 Clock.................................................................................................................... 459
16.6.2 SCI Initialization (Clocked Synchronous Mode) ................................................. 459
16.6.3 Serial Data Transmission (Clocked Synchronous Mode) .................................... 460
16.6.4 Serial Data Reception (Clocked Synchronous Mode).......................................... 463
16.6.5 Simultaneous Serial Data Transmission and Reception
(Clocked Synchronous Mode) ............................................................................. 465
16.7 Interrupt Sources............................................................................................................... 467
16.8 Usage Notes ...................................................................................................................... 469
16.8.1 Module Stop Mode Setting .................................................................................. 469
16.8.2 Break Detection and Processing .......................................................................... 469
16.8.3 Mark State and Break Sending............................................................................. 469
16.8.4 Receive Error Flags and Transmit Operations
(Clocked Synchronous Mode Only) .................................................................... 469
16.8.5 Relation between Writing to TDR and TDRE Flag ............................................. 469
16.8.6 SCI Operations during Mode Transitions ............................................................ 470
16.8.7 Switching from SCK Pins to Port Pins ................................................................ 473
Rev.1.00, 09/03, page xviii of xxxviii