DSP56303 FREESCALE [Freescale Semiconductor, Inc], DSP56303 Datasheet - Page 203

• Manufacturer Part Number: DSP56303
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

9.3.2 Signal Measurement Modes
The following signal measurement and pulse width modulation modes are provided:
The external signal synchronizes with the internal clock that increments the counter. This
synchronization process can cause the number of clocks measured for the selected signal value to
vary from the actual signal value by plus or minus one counter clock cycle.
Freescale Semiconductor
NOTE: If INV = 1, counter is clocked on 1-to-0 clock transitions, instead of 0-to-1 transitions.
Mode 3 (internal clock): TRM = 0
N = write preload
M = write compare
Measurement input width (Mode 4)
Measurement input period (Mode 5)
Measurement capture (Mode 6)
Pulse width modulation (PWM) mode (Mode 7)
TE
Clock
(TIO pin or prescale CLK)
TLR
Counter (TCR)
TCPR
TCF (Compare Interrupt if TCIE = 1)
TOF (Overflow Interrupt if TCIE = 1)
Figure 9-10. Event Counter Mode, TRM = 0
N
M
0
DSP56303 User’s Manual, Rev. 2
first event
N
N + 1
M
if clock source is from TIO pin,
TIO < CPUCLK + 4
M + 1
0
1
Operating Modes
9-11