Datasheet

t
d(IDLE-XCOH)
32 SYSCLKOUT Cycles
X1/XCLKIN
XCLKOUT
(H)
Wake-up Latency
Flushing Pipeline
t
d(wake)
A
B
C
D
Device
Status
E
G
F
PLL Lock-up Time
XNMI
Normal
Execution
HALT HALT
t
w(WAKE-XNMI)
t
p
Oscillator Start-up Time
TMS320F2810, TMS320F2811, TMS320F2812
TMS320C2810, TMS320C2811, TMS320C2812
www.ti.com SPRS174T –APRIL 2001–REVISED MAY 2012
Table 6-16. HALT Mode Timing Requirements
MIN NOM MAX UNIT
t
w(WAKE-XNMI)
Pulse duration, XNMI wakeup signal 2t
c(CI)
cycles
t
w(WAKE-XRS)
Pulse duration, XRS wakeup signal 8t
c(CI)
cycles
Table 6-17. HALT Mode Switching Characteristics
PARAMETER MIN TYP MAX UNIT
t
d(IDLE-XCOH)
Delay time, IDLE instruction executed to XCLKOUT high 32t
c(SCO)
45t
c(SCO)
cycles
t
p
PLL lock-up time 131072t
c(CI)
cycles
Delay time, PLL lock to program execution resume
• Wake up from flash
1125t
c(SCO)
cycles
t
d(WAKE)
– Flash module in sleep state
35t
c(SCO)
cycles
• Wake up from SARAM
A. IDLE instruction is executed to put the device into HALT mode.
B. 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.
C. 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.
D. When XNMI is driven active, the oscillator is turned on; but the PLL is not activated. The pulse duration of 2t
c(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.
E. When XNMI is deactivated, it initiates the PLL lock sequence, which takes 131,072 X1/XCLKIN cycles.
F. 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.
G. Normal operation resumes.
H. XCLKOUT = SYSCLKOUT
Figure 6-17. HALT Wakeup Using XNMI
Copyright © 2001–2012, Texas Instruments Incorporated Electrical Specifications 111
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