Toggle Mode, Trm = 1 - Freescale Semiconductor DSP56374 User Manual

Operating Modes
Mode 2 (internal clock): TRM = 1
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
Counter (TCR)
TCPR
TCF (Compare Interrupt if TCIE = 1)
TIO pin (INV = 0)
TIO pin (INV = 1)
Mode 2 (internal clock): TRM = 0
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
Counter (TCR)
TCPR
TCF (Compare Interrupt if TCIE = 1)
TIO pin (INV = 0)
TIO pin (INV = 1)
TOF (Overflow Interrupt if TCIE = 1)
9-8
first event
N
0 N N + 1
M
Figure 9-7. Toggle Mode, TRM = 1
first event
N
0 N
N + 1
M
Figure 9-8. Toggle Mode, TRM = 0
DSP56374 Users Guide, Rev. 1.2
M N N + 1
pulse width =
M - N clock
periods
M + 1 0
M 1
First toggle = M - N clock periods
Second and later toggles = 2
Freescale Semiconductor
24
clock periods