TMS320DM355CZCEA13 datasheet(152/163 Pages) TI1

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TIM_IN

TMS320DM355

SPRS463G – SEPTEMBER 2007 – REVISED JUNE 2010

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5.15 Timer

The DM355 contains four software-programmable timers. Timer 0, Timer 1, and Timer 3 (general-purpose

timers) can be programmed in 64-bit mode, dual 32-bit unchained mode, or dual 32-bit chained mode.

Timer 3 supports additional features over the other timers: external clock/event input, period reload, output

event tied to Real Time Out (RTO) module, external event capture, and timer counter register read reset.

Timer 2 is used only as a watchdog timer. Timer 2 is tied to device reset.

•

64-bit count-up counter

•

Timer modes:

–

64-bit general-purpose timer mode (Timer 0, 1, 3)

–

Dual 32-bit general-purpose timer mode (Timer 0, 1, 3)

–

Watchdog timer mode (Timer 2)

•

Two possible clock sources:

–

Internal clock

–

External clock/event input via timer input pins (Timer 3)

•

Three possible operation modes:

–

One-time operation (timer runs for one period then stops)

–

Continuous operation (timer automatically resets after each period)

–

Continuous operation with period reload (Timer 3)

•

Generates interrupts to the ARM CPU

•

Generates sync event to EDMA

•

Generates output event to device reset (Timer 2)

•

Generates output event to Real Timer Out (RTO) module (Timer 3)

•

External event capture via timer input pins (Timer 3)

For more detailed information, see the TMS320DM355 DMSoC 64-bit Timer User's Guide for more

information (literature number SPRUEE5).

5.15.1

Timer Electrical Data/Timing

Table 5-45. Timing Requirements for Timer Input(1) (2) (3) (see Figure 5-46)

DM355

NO.

PARAMETER

UNIT

MIN

MAX

tc(TIN)

Cycle time, TIM_IN

tw(TINPH)

Pulse duration, TIM_IN high

0.45C

0.55C

tw(TINPL)

Pulse duration, TIM_IN low

0.45C

0.55C

0.25C

tt(TIN)

Transition time, TIM_IN

or 10(4)

(1)

GPIO000, GPIO001, GPIO002, and GPIO003 can be used as external clock inputs for Timer 3. See the TMS320DM355 DMSoC 64-bit

Timer User's Guide for more information (literature number SPRUEE5).

(2)

P = MXI1/CLKIN cycle time in ns. For example, when MXI1/CLKIN frequency is 24 MHz use P = 41.6 ns.

(3)

C = TIM_IN cycle time in ns. For example, when TIM_IN frequency is 24 MHz use C = 41.6 ns

(4)

Whichever is smaller. C = the period of the applied signal. Maintaining transition times as fast as possible is recommended to improve

noise immunity on input signals.

Figure 5-46. Timer Input Timing

152

DM355 Peripheral Information and Electrical Specifications

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