r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 744

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 18 Compare Match Timer (CMT)
18.3
18.3.1
When an internal clock is selected with bits CKS1 and CKS0 in CMCSR and the STR bit in
CMSTR is set to 1, CMCNT starts incrementing using the selected clock. When the values in
CMCNT and CMCOR match, CMCNT is cleared to H'0000 and the CMF flag in CMCSR is set
to 1. When the CMIE bit in CMCSR is set to 1, a compare match interrupt (CMI) is requested.
CMCNT then starts counting up again from H'0000.
Figure 18.2 shows the operation of the compare match counter.
18.3.2
One of four internal clocks (Pφ/8, Pφ/32, Pφ/128, and Pφ/512) obtained by dividing the Pφ clock
can be selected with bits CKS1 and CKS0 in CMCSR. Figure 18.3 shows the timing.
Rev. 1.00 Sep. 21, 2007 Page 718 of 1124
REJ09B0402-0100
Peripheral operating
Count clock
clock (Pφ)
Operation
Interval Count Operation
CMCNT Count Timing
CMCNT
CMCOR
H'0000
CMCNT value
clock
Nth
Figure 18.2 Counter Operation
Figure 18.3 Count Timing
N
Counter cleared by compare
match with CMCOR
(N + 1)th
clock
Time
N + 1