Datasheet

OSCCLK
SYSCLKOUT
Write to PLLCR
OSCCLK * 2
(Current CPU
Frequency)
OSCCLK/2
(CPU frequency while PLL is stabilizing
with the desired frequency. This period
(PLL lock-up time t ) is 1 ms long.)
p
OSCCLK * 4
(Changed CPU frequency)
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
SPRS698D –NOVEMBER 2010–REVISED DECEMBER 2012 www.ti.com
Figure 5-6 shows an example for the effect of writing into PLLCR register. In the first phase, PLLCR =
0x0004 and SYSCLKOUT = OSCCLK x 2. The PLLCR is then written with 0x0008. Right after the PLLCR
register is written, the PLL lock-up phase begins. During this phase, SYSCLKOUT = OSCCLK/2. After the
PLL lock-up is complete, SYSCLKOUT reflects the new operating frequency, OSCCLK x 4.
Figure 5-6. Example of Effect of Writing Into PLLCR Register
68 Peripheral and Electrical Specifications Copyright © 2010–2012, Texas Instruments Incorporated
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