TMS320VC5504 datasheet(117/128 Pages) TI

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6.17 General-Purpose Timers

6.17.1 Timers Peripheral Register Description(s)

TMS320VC5504

Fixed-Point Digital Signal Processor

www.ti.com

SPRS609A – JUNE 2009 – REVISED JULY 2009

The VC5504 has three 32-bit software programmable Timers. Each timer can be used as a

general- purpose (GP) timer. Timer2 can be configured as either a GP or a Watchdog (WD) or both.

General-purpose timers are typically used to provide interrupts to the CPU to schedule periodic tasks or a

delayed task. A watchdog timer is used to reset the CPU in case it gets into an infinite loop. The GP

timers are 32-bit timers with a 13-bit prescaler that can divide the CPU clock and uses this scaled value as

a reference clock. These timers can be used to generate periodic interrupts. The Watchdog Timer is a

16-bit counter with a 16-bit prescaler used to provide a recovery mechanism for the device in the event of

a fault condition, such as a non-exiting code loop.

The VC5504 Timers support the following:

• 32-bit Programmable Countdown Timer

• 13-bit Prescaler Divider

• Timer Modes:

–

32-bit General-Purpose Timer

–

32-bit Watchdog Timer (Timer2 only)

• Auto Reload Option

• Generates Single Interrupt to CPU (The interrupt is individually latched to determine which timer

triggered the interrupt.)

• Generates Active Low Pulse to the Hardware Reset (Watchdog only)

• Interrupt can be Used for DMA Event

Table 6-39 through Table 6-42 show the Timer and Watchdog registers.

For more detailed information on the 32-bit General-Purpose Timers, the Watchdog Timer, and their

corresponding registers, see the TMS320VC5505 32-Bit Timer/Watchdog Timer User's Guide (literature

number SPRUFO2).

Table 6-39. Watchdog Timer Registers (Timer2 only)

CPU WORD

ACRONYM

ADDRESS

1880h

WDKCKLK

Watchdog Kick Lock Register

1882h

WDKICK

Watchdog Kick Register

1884h

WDSVLR

Watchdog Start Value Lock Register

1886h

WDSVR

Watchdog Start Value Register

1888h

WDENLOK

Watchdog Enable Lock Register

188Ah

WDEN

Watchdog Enable Register

188Ch

WDPSLR

Watchdog Prescale Lock Register

188Eh

WDPS

Watchdog Prescale Register

Table 6-40. General-Purpose Timer 0 Registers

CPU WORD

ACRONYM

ADDRESS

1810h

TCR

Timer 0 Control Register

1812h

TIMPRD1

Timer 0 Period Register 1

1813h

TIMPRD2

Timer 0 Period Register 2

1814h

TIMCNT1

Timer 0 Counter Register 1

1815h

TIMCNT2

Timer 0 Counter Register 2

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