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Section 9 Timers
Rev. 6.00 Sep 12, 2006 page 242 of 526
REJ09B0326-0600
9.5.2 Register
Descriptions
Free-Running Counter (FRC)
Free-Running Counter H (FRCH)
Free-Running Counter L (FRCL)
FRC
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Read/Write
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
FRCH
FRCL
FRC is a 16-bit read/write up-counter, which is incremented by internal or external clock input.
The clock source is selected by bits CKS1 and CKS0 in TCRX.
FRC can be cleared by compare match A, depending on the setting of CCLRA in TCSRX.
When FRC overflows from H'FFFF to H'0000, OVF is set to 1 in TCSRX. If OVIE = 1 in TIER, a
CPU interrupt is requested.
FRC can be written and read by the CPU. Since FRC has 16 bits, data is transferred between the
CPU and FRC via a temporary register (TEMP). For details see section 9.5.3, CPU Interface.
FRC is initialized to H'0000 upon reset and in standby mode, watch mode, subsleep mode, and
subactive mode.
Output Compare Registers A and B (OCRA, OCRB)
Output Compare Registers AH and BH (OCRAH, OCRBH)
Output Compare Registers AL and BL (OCRAL, OCRBL)
OCRA,
OCRB
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Read/Write
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
OCRAH, OCRBH
OCRAL, OCRBL
Содержание F-ZTAT H8/3642A Series
Страница 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Страница 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
Страница 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...