TMS320F28069MPZPQ datasheet(80/185 Pages) TI

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8.7 Low-power Modes Block

Table 8-16 summarizes the various modes.

Table 8-16. Low-power Modes

MODE

LPMCR0(1:0)

OSCCLK

CLKIN

SYSCLKOUT

EXIT(1)

IDLE

XRS, CPU-watchdog interrupt, any

enabled interrupt

STANDBY

(CPU-watchdog still running)

Off

XRS, CPU-watchdog interrupt, GPIO

Port A signal, debugger(2)

HALT(3)

Off

(on-chip crystal oscillator and PLL

turned off, zero-pin oscillator and

CPU-watchdog state dependent

on user code.)

Off

XRS, GPIO Port A signal, debugger(2),

CPU-watchdog

(1)

The EXIT column lists which signals or under what conditions the low-power mode is exited. A low signal, on any of the signals, exits

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

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

(2)

The JTAG port can still function even if the CPU clock (CLKIN) is turned off.

(3)

The WDCLK must be active for the device to go into HALT mode.

The various low-power modes operate as follows:

IDLE Mode:

This mode is exited by any enabled interrupt 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:

Any GPIO port A signal (GPIO[31:0]) can wake the device from STANDBY mode. The user must

select which signals will wake the device in the GPIOLPMSEL register. The selected signals are also

qualified by the OSCCLK before waking the device. The number of OSCCLKs is specified in the

LPMCR0 register.

HALT Mode:

CPU-watchdog, XRS, and any GPIO port A signal (GPIO[31:0]) can wake the device from HALT

mode. The user selects the signal in the GPIOLPMSEL register.

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 in when the IDLE instruction was executed. See the Systems

Control and Interrupts chapter of the TMS320x2806x Technical Reference Manual for more details.

TMS320F28069, TMS320F28069M, TMS320F28069F, TMS320F28068M, TMS320F28068F

TMS320F28067, TMS320F28066, TMS320F28065, TMS320F28064, TMS320F28063

TMS320F28062, TMS320F28062F

SPRS698I – NOVEMBER 2010 – REVISED FEBRUARY 2021

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