ENICSF2811PBKA datasheet(54/172 Pages) TI1

54 / 172 page

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174T – APRIL 2001 – REVISED MAY 2012

www.ti.com

3.12 Low-Power Modes Block

The low-power modes on the F281x and C281x are similar to the 240x devices. Table 3-18 summarizes

the various modes.

Table 3-18. F281x and C281x Low-Power Modes

MODE

LPM[1:0]

OSCCLK

CLKIN

SYSCLKOUT

EXIT(1)

Normal

X,X

–

XRS,

WDINT,

IDLE

0,0

on(2)

Any Enabled Interrupt,

XNMI,

Debugger(3)

XRS,

WDINT,

XINT1,

XNMI,

T1/2/3/4CTRIP,

STANDBY

0,1

off

(watchdog still running)

C1/2/3/4/5/6TRIP,

SCIRXDA,

SCIRXDB,

CANRX,

Debugger(3)

off

XRS,

HALT

1,X

(oscillator and PLL turned off,

off

XNMI,

watchdog not functional)

Debugger(3)

(1)

The Exit column lists which signals or under what conditions the low-power mode will be exited. A low signal, on any of the signals, will

exit the low-power condition. This signal must be kept low long enough for an interrupt to be recognized by the device. Otherwise, the

IDLE mode will not be exited and the device will go back into the indicated low-power mode.

(2)

The IDLE mode on the C28x behaves differently than on the 24x/240x. On the C28x, the clock output from the core (SYSCLKOUT) is

still functional; while on the 24x/240x, the clock is turned off.

(3)

On the C28x, the JTAG port can still function even if the core clock (CLKIN) is turned off.

The various low-power modes operate as follows:

IDLE Mode

This mode is exited by any enabled interrupt or an XNMI that is recognized

by the processor. The LPM block performs no tasks during this mode as

long as the LPMCR0(LPM) bits are set to 0,0.

STANDBY Mode

All other signals (including XNMI) will wake the device from STANDBY

mode if selected by the LPMCR1 register. The user will need to select

which signal(s) will wake the device. The selected signal(s) are also

qualified by the OSCCLK before waking the device. The number of

OSCCLKs is specified in the LPMCR0 register.

HALT Mode

Only the XRS and XNMI external signals can wake the device from HALT

mode. The XNMI input to the core has an enable/disable bit. Hence, it is

safe to use the XNMI signal for this function.

NOTE

The low-power modes do not affect the state of the output pins (PWM pins included). They

will be in whatever state the code left them when the IDLE instruction was executed.

Functional Overview

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Product Folder Link(s): TMS320F2810 TMS320F2811 TMS320F2812 TMS320C2810 TMS320C2811 TMS320C2812

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