Texas-instruments Digital Signal Processor SM320F2812-HT Instrukcja Użytkownika Pobierz pdf (Strona 101)

w(WAKE-INT)

d(WAKE-STBY)

d(IDLE−XCOH)

32 SYSCLKOUT Cycles

Wake−up

Signal

X1/XCLKIN

XCLKOUT

†

STANDBY Normal ExecutionSTANDBY

Flushing Pipeline

Device

Status

NOTES: 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 approximately 32 cycles before being turned

off. This 32-cycle delay enables the CPU pipe and any other pending operations to flush properly.

C. The device is now in STANDBY mode.

D. The external wake-up signal is driven active (negative edge triggered shown as an example).

E. After a latency period, the STANDBY mode is exited.

F. Normal operation resumes. The device responds to the interrupt (if enabled).

SM320F2812-HT

www.ti.com

SGUS062B– JUNE 2009– REVISED JUNE 2011

Figure 6-14. STANDBY Entry and Exit Timing

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Texas-instruments Digital Signal Processor SM320F2812-HT Instrukcja Użytkownika Strona 101