MC68HC16Z1CPV16 Datasheet, PDF (128/500 Pages) Freescale Semiconductor, Inc – Symbols and Operators, CPU16 Register Mnemonics

Freescale Semiconductor, Inc.
NOTE
The internal oscillator which supplies the input frequency for the PLL
always runs when a crystal is used.
SET UP INTERRUPT
TO WAKE UP MCU
FROM LPSTOP
NO
USING
EXTERNAL CLOCK?
YES
NO
USE SYSTEM CLOCK
AS SIMCLK IN LPSTOP?
YES
SET STSIM = 1
f_simclk1 = f_sys
IN LPSTOP
SET STSIM = 0
f_simclk1 = f_ref
IN LPSTOP
NO
WANT CLKOUT
ON IN LPSTOP?
YES
SET STEXT = 1
f_clkout2 = f_sys
f_eclk = ÷ f_sys
IN LPSTOP
SET STEXT = 0
f_clkout2 = 0 Hz
f_eclk = 0 Hz
IN LPSTOP
NO
WANT CLKOUT
ON IN LPSTOP?
YES
SET STEXT = 1
f_clkout2 = f_ref
f_eclk = 0 Hz
IN LPSTOP
SET STEXT = 0
f_clkout2 = 0 Hz
f_eclk = 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.
SIM LPSTOPFLOW
Figure 5-6 SIM LPSTOP Flowchart
5-22
SYSTEM INTEGRATION MODULE
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M68HC16 Z SERIES
USER’S MANUAL