MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 175
MC68HC908AS60MFN
Manufacturer Part Number
MC68HC908AS60MFN
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AS60MFN.pdf
(454 pages)
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10.8 Low-Power Modes
10.8.1 Wait Mode
10.8.2 Stop Mode
10.9 CGM During Break Interrupts
MC68HC908AS60 — Rev. 1.0
MOTOROLA
NOTE:
service routines from impeding software performance or from exceeding
stack limitations.
Software can select the CGMVCLK divided by two as the CGMOUT
source even if the PLL is not locked (LOCK = 0). Therefore, software
should make sure the PLL is locked before setting the BCS bit.
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
The CGM remains active in wait mode. Before entering wait mode,
software can disengage and turn off the PLL by clearing the BCS and
PLLON bits in the PLL control register (PCTL). Less power-sensitive
applications can disengage the PLL without turning it off. Applications
that require the PLL to wake the MCU from wait mode also can deselect
the PLL output without turning off the PLL.
The STOP instruction disables the CGM and holds low all CGM outputs
(CGMXCLK, CGMOUT, and CGMINT).
If CGMOUT is being driven by CGMVCLK and a STOP instruction is
executed, the PLL will clear the BCS bit in the PLL control register,
causing CGMOUT to be driven by CGMXCLK. When the MCU recovers
from STOP, the crystal clock divided by two drives CGMOUT and BCS
remains clear.
The BCFE bit in the break flag control register (BFCR) enables software
to clear status bits during the break state. See
Module.
Freescale Semiconductor, Inc.
For More Information On This Product,
Clock Generator Module (CGM)
Go to: www.freescale.com
Clock Generator Module (CGM)
Section 12. Break
Low-Power Modes
Technical Data
175
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