Motorola DSP56301 - Manual (Page 285)

Operating Modes
Triple Timer Module 9 -23
Figure 9-18. Watchdog Pulse Mode
Mode 9 (internal clock): TRM = 0
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
TCF (Compare Interrupt if TCIE = 1)
Counter (TCR)
first event
M
0 N M 1
N
TRM = 1 is not useful for watchdog function
0 M + 1
TOF (Overflow Interrupt if TOIE = 1)
TIO pin (INV = 0)
TIO pin (INV = 1)
(Software does not reset watchdog timer; watchdog times out)
N + 1
pulse width
= timer
clock period
float
float
low
high
TIO can connect to the RESET pin, internal hardware preserves the TIO value and
direction for an additional 2.5 clocks to ensure a reset of valid length.
TCPR