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SH7014 Datasheet(PDF) 460 Page - Renesas Technology Corp

Part # SH7014
Description  32-Bit RISC Microcomputer
PDF  754 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7014 Datasheet(HTML) 460 Page - Renesas Technology Corp

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15. Compare Match Timer (CMT)
Rev.5.00 Sep. 27, 2007 Page 426 of 716
REJ09B0398-0500
15.3
Operation
15.3.1
Period Count Operation
When an internal clock is selected with the CKS1, CKS0 bits of the CMCSR register and the STR
bit of the CMSTR is set to 1, the CMCNT begins incrementing with the selected clock. When the
CMCNT counter value matches that of the compare match constant register (CMCOR), the
CMCNT counter is cleared to H'0000 and the CMF flag of the CMCSR register is set to 1. If the
CMIE bit of the CMCSR register is set to 1 at this time, a compare match interrupt (CMI) is
requested. The CMCNT counter begins counting up again from H'0000.
Figure 15.2 shows the compare match counter operation.
CMCOR
H'0000
CMCNT value
Time
Counter cleared by
CMCOR compare match
Figure 15.2 Counter Operation
15.3.2
CMCNT Count Timing
One of four clocks (
φ/8, φ/32, φ/128, φ/512) obtained by dividing the system clock (CK) can be
selected by the CKS1, CKS0 bits of the CMCSR. Figure 15.3 shows the timing.
CK
N
− 1
N
N + 1
Internal clock
CMCNT input
clock
CMCNT
Figure 15.3 Count Timing



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