TMP320C2811PBKA datasheet(97/147 Pages) TI

97 / 147 page

Electrical Specifications

June 2004

SPRS257

6.15 Low-Power Mode Wakeup Timing

Table 6−9 is also the IDLE Mode Wake-Up Timing Requirements table.

Table 6−9. IDLE Mode Switching Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pulse duration, external wake-up

Without input qualifier

2*tc(SCO)

Cycles

tw(WAKE-INT)

Pulse duration, external wake-up

signal

With input qualifier

1*tc(SCO) + IQT†

Cycles

Delay time, external wake signal to

program execution resume‡

td(WAKE-IDLE)

− Wake-up from SARAM

Without input qualifier

8 * tc(SCO)

Cycles

− Wake-up from SARAM

With input qualifier

8 * tc(SCO) + IQT†

Cycles

† Input Qualification Time (IQT) = [5 x QUALPRD x 2] * tc(SCO)

‡ This is the time taken to begin execution of the instruction that immediately follows the IDLE instruction. Execution of an ISR (triggered by the

wake-up) signal involves additional latency.

WAKE INT‡

XCLKOUT†

A0−A15

td(WAKE−IDLE)

† XCLKOUT = SYSCLKOUT

‡ WAKE INT can be any enabled interrupt, WDINT, XNMI, or XRS.

tw(WAKE−INT)

Figure 6−10. IDLE Entry and Exit Timing

Table 6−10 is also the STANDBY Mode Wake-Up Timing Requirements table.

Table 6−10. STANDBY Mode Switching Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

td(IDLE-XCOH)

Delay time, IDLE instruction

executed to XCLKOUT high

32 * tc(SCO)

12 * tc(CI)

Cycles

Pulse duration, external

Without input qualifier

12 * tc(CI)

Cycles

tw(WAKE-INT)

Pulse duration, external

wake-up signal

With input qualifier

(2 + QUALSTDBY)† * tc(CI)

Cycles

td(WAKE-STBY)

Delay time, external wake

signal to program execution

resume‡

td(WAKE-STBY)

− Wake-up from SARAM

Without input qualifier

12 * tc(CI)

Cycles

− Wake-up from SARAM

With input qualifier

12 * tc(CI) + tw(WAKE-INT)

Cycles

† QUALSTDBY is a 6-bit field in the LPMCR0 register.

‡ This is the time taken to begin execution of the instruction that immediately follows the IDLE instruction. Execution of an ISR (triggered by the

wake-up) signal involves additional latency.

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