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Frequency Modulated Phase Locked Loop and System Clocks (FMPLL)
MPC5566 Microcontroller Reference Manual, Rev. 2
11-12
Freescale Semiconductor
11.2
External Signal Description
lists external signals used by the FMPLL during normal operation.
11.3
Memory Map/Register Definition
shows the FMPLL memory map locations.
11.3.1
Register Descriptions
The clock operation is controlled by the synthesizer control register (FMPLL_SYNCR) and status is
reported in the synthesizer status register (FMPLL_SYNSR). The following sections describe these
registers in detail.
11.3.1.1
Synthesizer Control Register (FMPLL_SYNCR)
The synthesizer control register (FMPLL_SYNCR) contains bits for defining the clock operation for the
system.
NOTE
To ensure proper operation for all MPC5500s, execute an
mbar
or
msync
instruction between: the write to change the FMPLL_SYNCR[MFD], and
the read to check the lock status shown by FMPLL_SYNSR[LOCK].
Buffered writes to the FMPLL, as controlled by
PBRIDGE_A_OPACR[BW0], must be disabled.
Table 11-2. PLL External Pin Interface
Name
I/O Type
Function
Pull
PLLCFG[0]_GPIO[208]
I/O
Configures the mode during reset. GPIO used otherwise.
Up
PLLCFG[1]_GPIO[209]
I/O
Configures the mode during reset. GPIO used otherwise.
Up
PLLCFG[2]
1
1
In this device, PLLCFG[2] is tied to ground.
I
Configures the crystal oscillator range
—
XTAL
Output
Output drive for external crystal
—
EXTAL_EXTCLK
Input
Crystal external clock input
—
V
DDSYN
Power
Analog power supply (3.3 V
±
10%)
—
V
SSSYN
Ground
Analog ground
—
Table 11-3. FMPLL Module Memory Map
Address
Register Name
Register Description
Bits
Base (0xC3F8_0000)
FMPLL_SYNCR
Synthesizer control register
32
Base + 0x0004
FMPLL_SYNSR
Synthesizer status register
32
Base + 0x0008–0xC3F8_3FFF
—
Reserved
—
Содержание MPC5566
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