MC68HC708MP16CFU Freescale Semiconductor, Inc, MC68HC708MP16CFU Datasheet - Page 110

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MC68HC708MP16CFU

Manufacturer Part Number
MC68HC708MP16CFU
Description
Manufacturer
Freescale Semiconductor, Inc
Datasheet
Clock Generator Module (CGM)
The following 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 start-up. The following conditions apply when in manual
mode:
Technical Data
110
The ACQ bit (see
8.6.2 PLL Bandwidth Control
read-only indicator of the mode of the filter. (See
Acquisition and Tracking
Modes.)
The ACQ bit is set when the VCO frequency is within a certain
tolerance, ∆
, and is cleared when the VCO frequency is out of
TRK
a certain tolerance, ∆
. (See
UNT
Specifications
for more information.)
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, ∆
, and is cleared when the VCO frequency is out
LOCK
of a certain tolerance, ∆
. (See
UNL
Specifications
for more information.)
CPU interrupts can occur if enabled (PLLIE = 1) when the PLL’s
lock condition changes, toggling the LOCK bit. (See
Control
Register.)
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
(see
8.10 Acquisition/Lock Time
ACQ
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.
Clock Generator Module (CGM)
Register) is a
8.4.2.2
8.10 Acquisition/Lock Time
8.10 Acquisition/Lock Time
8.6.1 PLL
BUSMAX
, after entering tracking mode
AL
MC68HC708MP16
Rev. 3.1
Freescale Semiconductor

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