參數(shù)資料
型號： TMS320DM355_07
廠商： Texas Instruments, Inc.
英文描述： Digital Media System-on-Chip (DMSoC)
中文描述： 數(shù)字媒體系統(tǒng)芯片（DMSoC）
文件頁數(shù)： 145/158頁
文件大?。?/td> 1319K
代理商： TMS320DM355_07
www.ti.com
P
5.15 Timer
5.15.1
Timer Electrical Data/Timing
1
2
4
4
3
TIM_IN
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
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 (SPRUEE5).
Table 5-45. Timing Requirements for Timer Input
(1)(2)(3)
(see
Figure 5-46
)
DM355
MIN
4P
0.45C
0.45C
NO.
UNIT
MAX
1
2
3
4
t
c(TIN)
t
w(TINPH)
t
w(TINPL)
t
t(TIN)
Cycle time, TIM_IN
Pulse duration, TIM_IN high
Pulse duration, TIM_IN low
Transition time, TIM_IN
ns
ns
ns
ns
0.55C
0.55C
0.05C
(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 (SPRUEE5).
P = MXI1/CLKIN cycle time in ns. For example, when MXI1/CLKIN frequency is 24 MHz use P = 41.6 ns.
C = TIM_IN cycle time in ns. For example, when TIM_IN frequency is 24 MHz use C = 41.6 ns
(2)
(3)
Figure 5-46. Timer Input Timing
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DM355 Peripheral Information and Electrical Specifications
145
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