mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 25

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Table 1-6
Freescale Semiconductor
shows the modes of operation for the MCG.
MCG Mode
BLPE
BLPI
Stop
FEE
FBE
PEE
PBE
FEI
FBI
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
FLL Engaged Internal — The output of the FLL is used as the MCU clock source.
The FLL uses the internal clock as a reference.
FLL Engaged External — The output of the FLL is used as the MCU clock source.
The FLL uses the external clock as a reference.
FLL Bypassed Internal — The internal reference clock is used directly as the MCU
clock source. The FLL is active and using the internal reference, but is not output.
FLL Bypassed External — The external reference clock is used directly as the
MCU clock source. The FLL is active and using the external reference, but is not
output.
PLL Engaged External — The output of the PLL is used as the MCU clock source.
The PLL uses the external clock as a reference.
PLL Bypassed External — The external reference clock is used directly as the
MCU clock source. The PLL is active and using the external reference, but is not
output.
Bypassed Low Power Internal — The internal reference clock is used directly as
the MCU clock source. Both the PLL and FLL are disabled.
Bypassed Low Power External — The external reference clock is used directly as
the MCU clock source. Both the PLL and FLL are disabled.
MCG Stopped — MCG output is stopped. MCG is in low power mode.
Table 1-6. MCG Clock Modes
Description
Device Overview
1-9