TMS320VC5502 datasheet(47/189 Pages) TI

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3.5.3

Timer Signal Selection Register (TSSR)

TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

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.

The Timer Signal Selection Register (TSSR) controls several pin characteristics for Timer 0, Timer 1, and

the Watchdog Timer. The TSSR can be used to specify whether the pins of Timer 0, Timer 1, and the

Watchdog Timer are inputs or outputs. The TSSR also determines how the interrupt signal of the

Watchdog Timer is connected internally and sets the function for the NMI/WDTOUT pin of the 5502. By

default, all timer pins (TIM0, TIM1, and NMI/WDTOUT) are set as inputs, the interrupt signal of the

Watchdog Timer is not internally connected to anything, and the NMI/WDTOUT pin has the function of the

NMI signal.

Reserved

R, 00000000

NMI/WDTOUT_

Reserved

WDT_MODE

TIM1_MODE

TIM0_MODE

IWCON

CFG

R, 00

R/W, 0

R/W, 00

R/W, 1

LEGEND: R = Read, W = Write, n = value at reset

Figure 3-8. Timer Signal Selection Register Layout (0x8000)

Table 3-8. Timer Signal Selection Register Bit Field Description

BIT NAME

BIT NO.

ACCESS

RESET VALUE

DESCRIPTION

Reserved

15-6

0000000000

Reserved

WDT_MODE

R/W

WDT pin mode

•

WDT_MODE = 0: WDTOUT pin is used as the timer input pin.

•

WDT_MODE = 1: WDTOUT pin is used as the timer output pin.

TIM1_MODE

R/W

TIM1 pin mode

•

TIM1_MODE = 0: TIM1 pin is used as the timer input pin.

•

TIM1_MODE = 1: TIM1 pin is used as the timer output pin.

TIM0_MODE

R/W

TIM0 pin mode

•

TIM0_MODE = 0: TIM0 pin is used as the timer input pin.

•

TIM0_MODE = 1: TIM0 pin is used as the timer output pin.

Functional Overview

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