Section 21 Compare Match Timer (CMT)
Rev. 1.00 Oct. 01, 2007 Page 755 of 1956
REJ09B0256-0100
21.3 Operation
21.3.1 Counter
Operation
The CMT starts the operation of the counter by writing a 1 to the STRn bit in CMSTR of a
channel that has been selected for operation. Complete all of the settings before starting the
operation. Do not change the register settings other than by clearing flag bits.
The counter operates in one of two ways.
•
One-Shot Operation
One-shot operation is selected by setting the CMM bit in CMCSR to 0. When the value in
CMCNT matches the value in CMCOR, the value in CMCNT is cleared to H'00000000 and
the CMF bit in CMCSR is set to 1. Counting by CMCNT stops after it has been cleared.
To detect an overflow interrupt, set the value in CMCOR to H'FFFFFFFF. When the value in
CMCNT matches the value in CMCOR, CMCNT is cleared to H'00000000 and bits CMF and
OVF in CMCSR are set to 1.
Value in
CMCNT
CMCOR
CMF = 1
OVF = 1 (When an overflow is detected)
H'00000000
Time
Figure 21.2 Counter Operation (One-Shot Operation)
•
Free-Running Operation
Free-running operation is selected by setting the CMM bit in CMCSR to 1. When the value in
CMCNT matches the value in CMCOR, CMCNT is cleared to H'00000000 and the CMF bit in
CMCSR is set to 1. CMCNT resumes counting-up after it has been cleared.
To detect an overflow interrupt, set CMCOR to H'FFFFFFFF. When the values in CMCNT
and CMCOR match, CMCNT is cleared to H'00000000 and bits CMF and OVF in CMCSR
are set to 1.
Summary of Contents for SH7763
Page 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Page 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Page 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Page 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Page 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Page 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Page 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Page 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Page 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Page 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Page 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Page 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Page 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Page 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Page 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Page 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Page 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Page 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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