TNETV2501INPGF datasheet(52/197 Pages) TI1

52 / 197 page

Functional Overview

December 2002 − Revised November 2008

SPRS206K

3.4.2 Timer Pins

The 5501 has one pin for each timer: TIM0 for Timer 0, TIM1 for Timer 1, and NMI/WDTOUT for the Watchdog

Timer. Either the output (TOUT) or input (TIN) signal can be connected to the timer pin (see Figure 3−7). When

the timer pin is configured as an output, the TOUT signal is connected to the pin. The TIN signal is connected

to the pin when the pin is configured as an input. Each pin can be configured as input or output through the

Timer Signal Selection Register (TSSR) (bits TIM0_MODE, TIM1_MODE, and WDT_MODE).

TIM0_MODE

TIM0

TIM1_MODE

TIM1

Timer0

TIN

TOUT

TIN

Timer1

WDT_MODE

NMI/WDTOUT

Watchdog

Timer

TSSR

TMS320VC5501 DSP

TOUT

TIN

Figure 3−7. Timer Pins

When configured as input, the timer pin can be used to source an external clock to the timer. Also, when the

timer pin is configured as input and the timer is running off an internal clock, the timer pin can be used to start

or stop count of the timer (clock gating).

When the timer pin is configured as an output, the timer pin can signal a pulse (pulse mode) or a change of

state (clock mode) when the timer count matches its period.

The NMI/WDTOUT pin has two functions: Watchdog Timer pin or NMI pin. The NMI/WDTOUT_CFG bit of the

TSSR controls the function of this pin. It is possible to configure the NMI/WDTOUT pin as NMI

(NMI/WDTOUT_CFG = ‘1’) and also connect the Watchdog Timer TINT signal to the NMI signal

(IWCON = ‘10’). In this case, the external NMI signal will be overridden by the TINT signal of the Watchdog

Timer, i.e., applying a signal to the NMI/WDTOUT pin will not generate the non-maskable interrupt NMI.

For all three timers (Timer 0, Timer 1, and the Watchdog Timer), both the TIN and TOUT signals can be used

for general-purpose input/output. The timer pin must be configured for input to use the TIN signal as

general-purpose input/output. The timer pin can be configured as an input by setting the pin mode bit of the

Timer Signal Selection Register (TSSR) to ‘0’. The TOUT signal can be used as general-purpose input/output

if the timer pin is configured for output. The timer pin can be configured as an output by setting the pin mode

bit of the TSSR to ‘1’. The GPIO Enable Register (GPEN), GPIO Direction Register (GPIODIR), and the GPIO

Data Register (GPDAT) of each timer can be used to control the state of the timer pins when used as

general-purpose input/output.

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