[O] Set Pll Output Frequency - Motorola MC145220EVK Manual

[O] Set PLL output frequency

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To access this command in the program, select a board in the "Define boards to program" screen and
then press [Q]! . This will place you in the "Select from the available options" screen. The command [O]
is on this screen.
See page 21 of this document for a sample screen shot of this command.
This command prompts the user to input a decimal value in MHz and kHz to set the targeted board fre-
quency. The program default PLL output frequency is displayed along with the current value. The user
may leave the output frequency value as is by entering return without entering a value. The program
validates the entered frequency by checking to ensure that the value is a multiple of the board's current
step size and that the entered frequency / frequency step size is
vide values < 4032 if N
N*P+A = total divide (p = prescale = 64 for '191), (p = prescale = 32 or 64 for '220)
A further check is made to ensure that the entered frequency is within the capability of the currently tar-
geted demonstration board. (See Table 7.) Frequencies outside the range are allowed for users who use
their own VCO. Note in '220 dual mode, frequencies outside the program default will not be accepted due
to the complexity of error checking the results.
Board Type
MC145190
MC145191
MC145192
MC145200
MC145201
MC145202
MC145220 in Single Loop Mode
MC145220 in Dual Loop Mode
Once validated, the NCOUNTER and ACOUNTER fields of the A register are appropriately modified to
set the PLL frequency for the targeted board to the specified value.
If the currently targeted board is an MC145220 in DUAL mode, then the currently targeted PLL on the
board will have its frequency set. If the MC145220 is in single mode, then both PLLs on the board will
have their frequencies set.
MOTOROLA
Freescale Semiconductor, Inc.
A. (Total divide must be
Table 7.
Minimum Frequency
741 MHz
733 MHz
733 MHz
1482 MHz
1466 MHz
1466 MHz
733 MHz (PLL)
790 MHz (PLL )
60 MHz
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4032. The program accepts total di-
262,143 for all PLLs.)
Maximum Frequency
751 MHz
743 MHz
738 MHz
1502 MHz
1486 MHz
1486 MHz
743 MHz (PLL)
820 MHz (PLL )
80 MHz
MC145220EVK
37