Motorola MC145192EVK Manual page 33

[Z] Change default high frequency
This command prompts the user (screen #5) to input a decimal value in MHz for the default high frequen-
cy. The program default high value is displayed along with the current value. The user may leave the high
frequency value as is by entering return without a value. The program high default value is dependent on
the targeted board type (see Table 4).
This value is not sent to the board immediately. It is the value that is sent to the board when the [L] com-
mand is executed.
Board Type
MC145190
MC145191
MC145192
MC145200
MC145201
MC145202
MC145220 in Single Loop Mode
MC145220 in Dual Loop Mode
[U]! Step frequency up by step size
This command increments the NCOUNTER and ACOUNTER fields of the A register for the currently
targeted board. This steps up the PLL's frequency by the current step size for the board.
If the currently selected board is an MC145220 in DUAL mode, then the currently targeted PLL on the
board is "stepped". If the MC145220 is in SINGLE mode, then both PLLs on the board are "stepped".
[D]! Step frequency down by step size
This command decrements the NCOUNTER and ACOUNTER fields of the A register for the currently
targeted board. This is the effect of stepping down the PLL's frequency by the current step size for the
board.
If the currently selected board is an MC145220 in DUAL mode, then the currently targeted PLL on the
board is "stepped". If the MC145220 is in SINGLE mode, then both PLLs on the board are "stepped".
[O] Set PLL output frequency
This command prompts the user (screen #3) to input a decimal value in MHz and kHz to set the targeted
board frequency. 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
total divide values < 4032 if N
N*P+A = total divide (p = prescale = 64 for '191).
A further check is made to ensure that the entered frequency is within the capability of the currently tar-
geted demonstration board (see Table 5). Frequencies outside the range are allowed for users who use
their own VCO.
MOTOROLA
Table 4.
A. (Total divide must be
Program Default High Frequency
751 MHz
743 MHz
743 MHz
1502 MHz
1486 MHz
1486 MHz
738 MHz (PLL)
820 MHz (PLL')
75 MHz
4032. The program accepts
262,143 for all PLLs.)
MC145192EVK MC145202EVK
33