SPMCK16Z4MPV20 datasheet(128/500 Pages) FREESCALE

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SYSTEM INTEGRATION MODULE

M68HC16 Z SERIES

5-22

USER’S MANUAL

NOTE

The internal oscillator which supplies the input frequency for the PLL

always runs when a crystal is used.

Figure 5-6 SIM LPSTOP Flowchart

USING

EXTERNAL CLOCK?

YES

USE SYSTEM CLOCK

AS SIMCLK IN LPSTOP?

YES

SET STSIM = 1

fsimclk

1 = f

sys

IN LPSTOP

WANT CLKOUT

ON IN LPSTOP?

YES

WANT CLKOUT

ON IN LPSTOP?

SET STSIM = 0

fsimclk

1 = f

ref

IN LPSTOP

SET STEXT = 1

fclkout

2 = f

sys

feclk = ÷ fsys

IN LPSTOP

SET STEXT = 0

fclkout

2 = 0 Hz

feclk = 0 Hz

IN LPSTOP

SET STEXT = 1

fclkout

2 = f

ref

feclk = 0 Hz

IN LPSTOP

SET STEXT = 0

fclkout

2 = 0 Hz

feclk = 0 Hz

IN LPSTOP

ENTER LPSTOP

NOTES:

1. THE SIMCLK IS USED BY THE PIT, IRQ, AND INPUT BLOCKS OF THE SIM.

2. CLKOUT CONTROL DURING LPSTOP IS OVERRIDDEN BY THE EXOFF BIT IN SIMCR. 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.

SET UP INTERRUPT

TO WAKE UP MCU

FROM LPSTOP

SIM LPSTOPFLOW

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

SPMCK16Z4MPV20 Datasheet(PDF) 128 Page - Freescale Semiconductor, Inc

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