HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 607

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

16.3
16.3.1
When an internal clock is selected with the CKS1, CKS0 bits of the CMCSR register and the STR
bit of CMSTR is set to 1, 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 16.2 shows the compare match counter operation.
16.3.2
One of four clocks (Pφ/8, Pφ/32, Pφ/128, Pφ/512) obtained by dividing the peripheral clock (Pφ)
can be selected by the CKS1 and CKS0 bits of CMCSR. Figure 16.3 shows the CMCNT count
timing.
Operation
Compare Match Counter Operation
CMCNT Count Timing
Internal
clock
CMCNT
input clock
CMCNT
Pφ
CMCOR
H'0000
CMCNT value
N-1
Figure 16.2 Counter Operation
Figure 16.3 Count Timing
N
Counter cleared by CMCOR
compare match
Rev.4.00 Mar. 27, 2008 Page 563 of 882
16. Compare Match Timer (CMT)
N+1
Time
REJ09B0108-0400