HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 388
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HD6437101
Manufacturer Part Number
HD6437101
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6437101.pdf
(560 pages)
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Section 12 Compare Match Timer (CMT)
12.2.3
CMCNT is a 16-bit register used as an up-counter for generating interrupt requests. CMCNT is
initialized to H'0000.
12.2.4
CMCOR is a 16-bit register that sets the period for compare match with CMCNT. CMCOR is
initialized to H'FFFF.
12.3
12.3.1
When an internal clock is selected with the CKS1 and CKS0 bits in CMCSR and the STR bit in
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 in CMCSR is set to 1. If the CMIE bit in CMCSR
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 12.2 shows the compare match counter operation.
Rev.1.00 Sep. 18, 2008 Page 354 of 522
REJ09B0069-0100
Compare Match Timer Counters_0 and 1 (CMCNT_0, CMCNT_1)
Compare Match Timer Constant Registers_0 and 1 (CMCOR_0, CMCOR_1)
Operation
Cyclic Count Operation
CMCOR
H'0000
CMCNT value
Figure 12.2 Counter Operation
Counter cleared by CMCOR
compare match
Time
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