SPMC68CK338CPV14 datasheet(21/133 Pages) FREESCALE

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MC68CK338

MOTOROLA

MC68CK338TS/D

Figure 8 LPSTOP Flowchart

SETUP INTERRUPT

TO WAKE UP MCU

FROM LPSTOP

LEAVE IMBCLK1

ON IN LPSTOP?

YES

SET STOP BITS FOR

MODULES THAT WILL

NOT BE ACTIVE IN

LPSTOP

SET STCPU2 = 1

fimbclk = fsys

IN LPSTOP

SET STCPU2 = 0

fimbclk = 0 Hz

IN LPSTOP

USING

EXTERNAL CLOCK?

YES

USE SYSTEM CLOCK

AS SIMCLK IN LPSTOP?

YES

SET STSIM = 1

fsimclk

3 = f

sys

IN LPSTOP

WANT CLKOUT

ON IN LPSTOP?

YES

WANT CLKOUT

ON IN LPSTOP?

SET STSIM = 0

fsimclk

3 = f

ref

IN LPSTOP

SET STEXT = 1

fclkout

4 = f

sys

feclk = ÷ fsys

IN LPSTOP

SET STEXT = 0

fclkout

4 = 0 Hz

feclk = ÷ 0 Hz

IN LPSTOP

SET STEXT = 1

fclkout

4 = f

ref

feclk = ÷ 0 Hz

IN LPSTOP

SET STEXT = 0

fclkout

4 = 0 Hz

feclk = ÷ 0 Hz

IN LPSTOP

ENTER LPSTOP

NOTES:

1. IMBCLK IS THE CLOCK USED BY THE CPU32L, QSM, CTM6, AND THE SIML.

2. WHEN STCPU = 1, THE CPU32L IS SHUTDOWN IN LPSTOP. ALL OTHER MODULES WILL REMAIN ACTIVE UNLESS

THE STOP BITS IN THEIR MODULE CONFIGURATION REGISTERS ARE SET PRIOR TO ENTERING LPSTOP.

3. THE SIMCLK IS USED BY THE PIT, IRQ, AND INPUT BLOCKS OF THE SIML.

4. CLKOUT CONTROL DURING LPSTOP IS OVERRIDDEN BY THE EXOFF BIT IN SIMLCR. IF EXOFF = 1, THE CLKOUT

PIN IS ALWAYS IN A HIGH IMPEDANCE STATE AND STEXT HAS NO EFFECT IN LPSTOP. IF EXOFF = 0, CLKOUT

IS CONTROLLED BY STEXT IN LPSTOP. WHEN STCPU = 1, THE CPU32L IS DISABLED IN LPSTOP, BUT ALL OTHER

MODULES REMAIN ACTIVE OR STOPPED ACCORDING TO THE SETTING.

LPSTOP FLOWCHART

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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