Datasheet
t
w(WAKE-INT)
t
d(WAKE-STBY)
t
d(IDLE−XCOL)
Wake-up
Signal
X1/X2 or
X1 or
XCLKIN
XCLKOUT
STANDBY Normal ExecutionSTANDBY
Flushing Pipeline
(A)
(B)
(C)
(D)
(E)
(F)
Device
Status
TMS320C28346, TMS320C28345, TMS320C28344
TMS320C28343, TMS320C28342, TMS320C28341
SPRS516D –MARCH 2009–REVISED AUGUST 2012
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Table 6-15. STANDBY Mode Timing Requirements
TEST CONDITIONS MIN NOM MAX UNIT
Without input qualification 3t
c(OSCCLK)
Pulse duration, external
t
w(WAKE-INT)
cycles
wake-up signal
With input qualification
(1)
(2 + QUALSTDBY) * t
c(OSCCLK)
(1) QUALSTDBY is a 6-bit field in the LPMCR0 register.
Table 6-16. STANDBY Mode Switching Characteristics
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Delay time, IDLE instruction
t
d(IDLE-XCOL)
32t
c(SCO)
45t
c(SCO)
cycles
executed to XCLKOUT low
Delay time, external wake
t
d(WAKE-STBY)
signal to program execution cycles
resume
(1)
Without input qualifier 100t
c(SCO)
cycles
• Wake up from SARAM
With input qualifier 100t
c(SCO)
+ t
w(WAKE-INT)
(1) 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.
A. IDLE instruction is executed to put the device into STANDBY mode.
B. The PLL block responds to the STANDBY signal. SYSCLKOUT is held for 32 cycles before being turned off. This
delay enables the CPU pipeline and any other pending operations to flush properly. If an access to XINTF is in
progress and its access time is longer than this number then it will fail. It is recommended to enter STANDBY mode
from SARAM without an XINTF access in progress.
C. Clock to the peripherals are turned off. However, the PLL and watchdog are not shut down. The device is now in
STANDBY mode.
D. The external wake-up signal is driven active.
E. After a latency period, the STANDBY mode is exited.
F. Normal execution resumes. The device will respond to the interrupt (if enabled).
Figure 6-12. STANDBY Entry and Exit Timing Diagram
126 Electrical Specifications Copyright © 2009–2012, Texas Instruments Incorporated
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