TMS320LF2401A_07 Datasheet, PDF (68/88 Pages) Texas Instruments – DSP CONTROLLERS

TMS320LF2401A, TMS320LC2401A
DSP CONTROLLERS
SPRS161K − MARCH 2001 − REVISED JULY 2007
low-power mode timing
switching characteristics over recommended operating conditions [H = 0.5t_c(CO)]
(see Figure 30, Figure 31, and Figure 32)
td(WAKE-A)
td(IDLE-COH)
td(WAKE-OSC)
td(IDLE-OSC)
td(EX)
PARAMETER
LOW-POWER MODES
Delay time, CLKOUT switching to
program execution resume
IDLE1
IDLE2
LPM0
LPM1
Delay time, Idle instruction executed to
CLKOUT high
IDLE2
LPM1
Delay time, wake-up interrupt
asserted to oscillator running
Delay time, Idle instruction executed to
oscillator power off
HALT
{PLL/OSC power down}
Delay time, reset vector executed after RS high
LPM2
MIN
TYP
MAX
12 × tc(CO)
15 × tc(CO)
4tc(CO)
OSC start-up
and PLL lock
time
4tc(CO)
36H
UNIT
ns
ns
ms
ns
ns
A0−A15
CLKOUT†‡
td(WAKE−A)
WAKE INT§
† _{In 2401A, CLKOUT will not be seen at the pin, only in some modes; it can be enabled in software.}
‡ _{Unlike other 24x/240x devices, the CLKOUT signal does not appear on the CLKOUT pin by default (after a device reset). The CLKOUT waveform}
depicted in the figure is present internally in the DSP. However, in order to route the internal CLKOUT signal to the
XINT2/ADCSOC/CAP1/IOPA7/CLKOUT pin, bit 7 of the MCRA register must be programmed appropriately.
§ _{WAKE INT can be any valid interrupt or RESET.}
Figure 30. IDLE1 Entry and Exit Timing − LPM0
A0−A15
td(IDLE−COH)
CLKOUT†‡
WAKE INT§
td(WAKE−A)
† _{In 2401A, CLKOUT will not be seen at the pin, only in some modes; it can be enabled in software.}
‡ _{Unlike other 24x/240x devices, the CLKOUT signal does not appear on the CLKOUT pin by default (after a device reset). The CLKOUT waveform}
depicted in the figure is present internally in the DSP. However, in order to route the internal CLKOUT signal to the
XINT2/ADCSOC/CAP1/IOPA7/CLKOUT pin, bit 7 of the MCRA register must be programmed appropriately.
§ _{WAKE INT can be any valid interrupt or RESET.}
Figure 31. IDLE2 Entry and Exit Timing − LPM1
68
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443