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3.5.2

Timer Pins

TIM0_MODE

TIM0

TIM1_MODE

TIM1

Timer0

TIN

TOUT

TIN

Timer1

WDT_MODE

NMI/WDTOUT

Watchdog

Timer

TSSR

TMS320VC5502 DSP

TOUT

TIN

TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

The interrupt signal for the Watchdog Timer can be internally connected to the RESET, INT3, or NMI

signals by setting the IWCON bit of the Timer Signal Selection Register (TSSR) appropriately (see

Figure 3-6). The DSP will be reset once the Watchdog Timer generates an interrupt if the timer interrupt is

connected to RESET (IWCON = '01'). A non-maskable interrupt will be generated if the timer interrupt is

connected to NMI (IWCON = '10'). An external interrupt will be generated when the timer interrupt signal is

connected to INT3 (IWCON = '11'), but only if the INT3 bit of IER0 is set to '1'.

Refer to Section 3.17, Interrupts, for more information on using interrupts.

The 5502 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).

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.

Functional Overview

TMS320VC5502 Datasheet(PDF) 46 Page - Texas Instruments

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