TMS320F2812 datasheet(110/170 Pages) TI

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d(IDLE-XCOH)

32 SYSCLKOUT Cycles

X1/XCLKIN

XCLKOUT

(H)

Wake-up Latency

Flushing Pipeline

d(wake)

Device

Status

PLL Lock-up Time

XNMI

Normal

Execution

HALT

w(WAKE-XNMI)

Oscillator Start-up Time

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174S – APRIL 2001 – REVISED MARCH 2011

www.ti.com

Table 6-16. HALT Mode Timing Requirements

MIN

NOM

MAX

UNIT

tw(WAKE-XNMI)

Pulse duration, XNMI wakeup signal

2tc(CI)

cycles

tw(WAKE-XRS)

Pulse duration, XRS wakeup signal

8tc(CI)

cycles

Table 6-17. HALT Mode Switching Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

td(IDLE-XCOH)

Delay time, IDLE instruction executed to XCLKOUT high

32tc(SCO)

45tc(SCO)

cycles

PLL lock-up time

131072tc(CI)

cycles

Delay time, PLL lock to program execution resume

•

Wake up from flash

1125tc(SCO)

cycles

td(WAKE)

–

Flash module in sleep state

35tc(SCO)

cycles

•

Wake up from SARAM

IDLE instruction is executed to put the device into HALT mode.

The PLL block responds to the HALT signal. SYSCLKOUT is held for another 32 cycles before the oscillator is turned

off and the CLKIN to the core is stopped. This 32-cycle delay enables the CPU pipe and any other pending

operations to flush properly.

Clocks to the peripherals are turned off and the internal oscillator and PLL are shut down. The device is now in HALT

mode and consumes absolute minimum power.

When XNMI is driven active, the oscillator is turned on; but the PLL is not activated. The pulse duration of 2tc(CI) is

applicable when an external oscillator is used. If the internal oscillator is used, the oscillator wake-up time should be

added to this parameter.

When XNMI is deactivated, it initiates the PLL lock sequence, which takes 131,072 X1/XCLKIN cycles.

When CLKIN to the core is enabled, the device will respond to the interrupt (if enabled), after a latency. The HALT

mode is now exited.

Normal operation resumes.

XCLKOUT = SYSCLKOUT

Figure 6-17. HALT Wakeup Using XNMI

110

Electrical Specifications

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