Section 21 Compare Match Timer (CMT)
Rev. 1.00 Oct. 01, 2007 Page 757 of 1956
REJ09B0256-0100
21.3.4
DMA Transfer Requests and Internal Interrupt Requests to CPU
The setting of bits CMR1 and CMR0 in CMCSR selects the sending of a request for a DMA
transfer or for an internal interrupt to the CPU at a compare match.
A DMA transfer request has different specifications according to the CMT channel as described
below.
1. For channels 0 and 1, a single DMA transfer request is output at a compare match.
2. For channels 2 to 4, a DMA transfer request continues until the amount of data transferred has
reached the value set in the DMAC, and the output of the request then automatically stops.
To clear the interrupt request, the CMF bit should be set to 0. Set the CMF bit to 0 in the handling
routine for the CMT interrupt.
21.3.5 Compare
Match
Flag
Set Timing (All Channels)
The CMF bit in CMCSR is set to 1 by the compare match signal generated when CMCOR and
CMCNT match. The compare match signal is generated upon the final state of the match (timing
at which the CMCNT value is updated to H'0000). Consequently, after CMCOR and CMCNT
match, a compare match signal will not be generated until a CMCNT counter clock is input.
Figure 21.4 shows the set timing of the CMF bit.
Peripheral operating
clock (Pck0)
Counter clock
CMCNT
CMCOR
Compare match signal
and interrupt signal
N + 1
clock
N
0
N
Figure 21.4 CMF Set Timing
Содержание SH7763
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Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
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Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
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Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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