Motorola DSP56301 - Manual (Page 269)

Operating Modes
Triple Timer Module 9 -7
Figure 9-3. Timer Mode (TRM = 1)
Figure 9-4. Timer Mode (TRM = 0)
Mode 0 (internal clock, no timer output): TRM = 1
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
TCPR
TCF (Compare Interrupt if TCIE = 1)
Counter (TCR)
first event last event
M
0 N N + 1 M N N + 1
N
Mode 0 (internal clock, no timer output): TRM = 0
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
TCPR
TCF (Compare Interrupt if TCIE = 1)
Counter (TCR)
first event last event
M
0 N N + 1 M 0 1
N
M + 1
TOF (Overflow Interrupt if TCIE = 1)