Ptv Value And Corresponding Division Value; Timer Characteristics - Texas Instruments OMAP5910 Technical Reference Manual

Timer Description
Table 6–2. PTV Value and Corresponding Division Value
Table 6–3. Timer Characteristics
t , Clock
clk
Input Clock
Period
100 MHz 10 ns
100 MHz 10 ns
12 MHz 83.3 ns
12 MHz 83.3 ns
6-4
Table 6–2 provides division values for each PTV field.
The timer interrupt period is determined in the following manner, where t
the clock period of the input clock, LOAD_TIM (see Table 6–1) is the register
that holds the value loaded when the timer passes through 0 or when it starts,
and PTV is the prescaler field located in the control timer register
(CNTL_TIMER):
t = t X (LOAD_TIM + 1) x 2
int clk
Table 6–3 shows the timer characteristics for the three timers for different input
frequencies.
LOAD_TIM
0000 0001
FFFF FFFF (max
interrupt period)
0000 0001
FFFF FFFF (max
interrupt period)
PTV Divisor
0 2
1 4
2 8
3 16
4 32
5 64
6 128
7 256
(PTV+1)
t , Timer
int
Interrupt
Period, for
PTV = 0
40 ns
85.9 s
333.4 ns
715.5 s
t , Timer Interrupt Period,
int
for PTV = 7
5.12 µs
10995 s (3 hr 3' 25")
42.64 µs
91589 s (25 hr, 26'29")
is
clk