
WAKE INT
(A)(B)
XCLKOUT
Address/Data
(internal)
t
d(WAKE−IDLE)
t
w(WAKE−INT)
151
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
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SPRS698F – NOVEMBER 2010 – REVISED MARCH 2016
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Detailed Description
Copyright © 2010–2016, Texas Instruments Incorporated
6.9.15.1.4 Low-Power Mode Wakeup Timing
Table 6-77
shows the timing requirements,
Table 6-78
shows the switching characteristics, and
Figure 6-
60
shows the timing diagram for IDLE mode.
(1)
For an explanation of the input qualifier parameters, see
Table 6-76
.
Table 6-77. IDLE Mode Timing Requirements
(1)
MIN
MAX
UNIT
t
w(WAKE-INT)
Pulse duration, external wake-up signal
Without input qualifier
2t
c(SCO)
cycles
With input qualifier
5t
c(SCO)
+ t
w(IQSW)
(1)
For an explanation of the input qualifier parameters, see
Table 6-76
.
(2)
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.
Table 6-78. IDLE Mode Switching Characteristics
(1)
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
d(WAKE-IDLE)
Delay time, external wake signal to program execution resume
(2)
cycles
•
Wake-up from flash
–
Flash module in active state
Without input qualifier
20t
c(SCO)
cycles
With input qualifier
20t
c(SCO)
+ t
w(IQSW)
•
Wake-up from flash
–
Flash module in sleep state
Without input qualifier
1050t
c(SCO)
cycles
With input qualifier
1050t
c(SCO)
+ t
w(IQSW)
•
Wake-up from SARAM
Without input qualifier
20t
c(SCO)
cycles
With input qualifier
20t
c(SCO)
+ t
w(IQSW)
A.
WAKE INT can be any enabled interrupt, WDINT or XRS. After the IDLE instruction is executed, a delay of
five OSCCLK cycles (minimum) is needed before the wake-up signal could be asserted.
B.
From the time the IDLE instruction is executed to place the device into low-power mode (LPM), wakeup should not be
initiated until at least four OSCCLK cycles have elapsed.
Figure 6-60. IDLE Entry and Exit Timing