mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 116

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGM)
Advance Information
116
These conditions apply when the PLL is in automatic bandwidth control
mode:
The PLL also may operate in manual mode (AUTO = 0). Manual mode
is used by systems that do not require an indicator of the lock condition
for proper operation. Such systems typically operate well below f
and require fast startup. These conditions apply when in manual mode:
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The ACQ bit (see 8.6.2 PLL Bandwidth Control Register) is a
read-only indicator of the mode of the filter. For more information,
see
The ACQ bit is set when the VCO frequency is within a certain
tolerance,
a certain tolerance,
Acquisition/Lock Time
The LOCK bit is a read-only indicator of the locked state of the
PLL.
The LOCK bit is set when the VCO frequency is within a certain
tolerance,
a certain tolerance,
Acquisition/Lock Time
CPU interrupts can occur if enabled (PLLIE = 1) when the PLL’s
lock condition changes, toggling the LOCK bit. For more
information, see
ACQ is a writable control bit that controls the mode of the filter.
Before turning on the PLL in manual mode, the ACQ bit must be
clear.
Before entering tracking mode (ACQ = 1), software must wait a
given time, t
Specifications), after turning on the PLL by setting PLLON in the
PLL control register (PCTL).
Software must wait a given time, t
before selecting the PLL as the clock source to CGMOUT
(BCS = 1).
The LOCK bit is disabled.
CPU interrupts from the CGM are disabled.
8.4.2.2 Acquisition and Tracking
Clock Generator Module (CGM)
TRK
Lock
ACQ
, and is cleared when the VCO frequency is out of
, and is cleared when the VCO frequency is out of
8.6.1 PLL Control
(see
UNT
UNL
8.9 Acquisition/Lock Time
Specifications.
Specifications.
. For more information, see
. For more information, see
AL
, after entering tracking mode
Register.
Modes.
MC68HC908MR24
Freescale Semiconductor
8.9
8.9
—
BUSMAX
Rev. 4.1