Section 19 Compare Match Timer (CMT)
Rev.1.00 Dec. 13, 2005 Page 699 of 1286
REJ09B0158-0100
19.4.5
16-Bit Timer: Output Compare
When the value of CMTCHnC (n = 1, 0) matches the lower 16-bit of CMTCHnT while the timer
CMTCH0C is operating, the output is inverted. Then the ICn flag in CMTIRQS is set to 1 and the
interrupt is generated when the ICEn bit in CMTCTL is set to 1. However, when the lower 16-bit
of time register CMTCHnT is H'0000, the compare match does not occur.
Each channel timer overflowed after the timer is counting up at H'FFFF that is the value of
CMTCHnC (n = 3 to 0). Then the IOn flag in CMTIRQS is set to 1 and the interrupt is generated
when the IOEn bit in CMTCTL is set to 1.
The 16-bit timer CMTCHnC (n = 3 to 0) is initialized to H'0000 when the TEn (n = 1, 0) bit in
CMTCL is cleared to 0 or a compare match occurs.
Note that channels 2 and 3 do not have the output pin, use as the interval timer to generate an
interrupt with regular period.
CMTI
CMT_CTRn
16-bit counter =
channel time
Clock generation
16-bit counter
Channel time register
Figure 19.11 16-Bit Timer Mode: Output Compare
(CMT_CTR pins are available for channel 1 and channel 0)
Содержание SH7780 Series
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