SH7243 datasheet(19/1726 Pages) RENESAS

19 / 1726 page

Rev. 1.00 Jun. 26, 2008 Page xix of xxx

14.5

Usage Notes ...................................................................................................................... 732

14.5.1

Conflict between Write and Compare-Match Processes of CMCNT ............... 732

14.5.2

Conflict between Word-Write and Count-Up Processes of CMCNT ............... 733

14.5.3

Conflict between Byte-Write and Count-Up Processes of CMCNT................. 734

14.5.4

Compare Match between CMCNT and CMCOR ............................................. 734

Section 15 Watchdog Timer (WDT)....................................................................735

15.1

Features............................................................................................................................. 735

15.2

Input/Output Pin ............................................................................................................... 737

15.3

Register Descriptions ........................................................................................................ 738

15.3.1

Watchdog Timer Counter (WTCNT)................................................................ 738

15.3.2

Watchdog Timer Control/Status Register (WTCSR)........................................ 739

15.3.3

Watchdog Reset Control/Status Register (WRCSR) ........................................ 742

15.3.4

Notes on Register Access.................................................................................. 743

15.4

WDT Usage ...................................................................................................................... 745

15.4.1

Changing the Frequency ................................................................................... 745

15.4.2

Using Watchdog Timer Mode........................................................................... 746

15.4.3

Using Interval Timer Mode .............................................................................. 748

15.5

Usage Notes ...................................................................................................................... 749

15.5.1

Timer Variation................................................................................................. 749

15.5.2

Prohibition against Setting H'FF to WTCNT.................................................... 749

15.5.3

System Reset by

WDTOVF Signal................................................................... 749

15.5.4

Manual Reset in Watchdog Timer Mode .......................................................... 750

Section 16 Serial Communication Interface (SCI) ..............................................751

16.1

Features............................................................................................................................. 751

16.2

Input/Output Pins.............................................................................................................. 753

16.3

Register Descriptions ........................................................................................................ 754

16.3.1

Receive Shift Register (SCRSR)....................................................................... 755

16.3.2

Receive Data Register (SCRDR) ...................................................................... 755

16.3.3

Transmit Shift Register (SCTSR) ..................................................................... 756

16.3.4

Transmit Data Register (SCTDR)..................................................................... 756

16.3.5

Serial Mode Register (SCSMR)........................................................................ 756

16.3.6

Serial Control Register (SCSCR)...................................................................... 760

16.3.7

Serial Status Register (SCSSR) ........................................................................ 763

16.3.8

Serial Port Register (SCSPTR) ......................................................................... 769

16.3.9

Serial Direction Control Register (SCSDCR)................................................... 771

16.3.10

Bit Rate Register (SCBRR) .............................................................................. 772

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