Triple Timer Module
Mode 5 (internal clock): TRM = 1 first event
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
N
Counter
0
N
N+1
M
N
Counter continues
TCR
TIO pin
period being measured
M
N + 1
counting, does
not stop
Interrupt Service
TCF (Compare Interrupt if TCIE = 1)
reads TCR; period
= M - N clock
periods
NOTE: If INV = 1, a 1-to-0 edge on TIO loads the counter, and a 0-to-1 edge on TIO
loads TCR with count and the counter with N.
Figure 9-13. Period Measurement Mode, TRM = 1
Mode 5 (internal clock): TRM = 0 first event
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
N
Counter
0
N
N+1
M
M+1
Counter continues
TCR
TIO pin
period being measured
M
N + 1
counting, does
not stop. Overflow
may occur (TOF=1).
Interrupt Service
TCF (Compare Interrupt if TCIE = 1)
reads TCR; period
= M - N clock
periods
NOTE: If INV = 1, a 1-to-0 edge on TIO loads the counter, and a 0-to-1 edge on TIO
loads TCR with count and the counter with N.
Figure 9-14. Period Measurement Mode, TRM = 0
DSP56311 User’s Manual, Rev. 2
9-14
Freescale Semiconductor
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