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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
121
6.7.6.2
Progressive clock switching
Progressive clock switching allows to switch the system clock to FMPLL output clock stepping through
different division factors. This means that the current consumption gradually increases and, in turn, voltage
regulator response is improved.
This feature can be enabled by programming CR[EN_PLL_SW] bit. When enabled, the system clock is
switched to divided PHI. The FMPLL_clk divider is then progressively decreased to the target divider as
shown in
.
Figure 6-9. FMPLL output clock division flow during progressive switching
6.7.6.3
Normal mode with frequency modulation
The FMPLL default mode is without frequency modulation enabled. When frequency modulation is
enabled, however, two parameters must be set to generate the desired level of modulation: the PERIOD
and the STEP. The modulation waveform is always a triangle wave and its shape is not programmable.
FM mode is activated in two steps:
1. Configure the FM mode characteristics: MOD_PERIOD, INC_STEP.
2. Enable the FM mode by programming bit FM_EN of the MR to 1. FM mode can only be enabled
when FMPLL is in lock state.
There are two ways to latch these values inside the FMPLL, depending on the value of bit STRB_BYPASS
in the MR.
If STRB_BYPASS is low, the modulation parameters are latched in the FMPLL only when the strobe
signal goes high for at least two cycles of CLKIN clock. The strobe signal is automatically generated in
the FMPLL digital interface when the modulation is enabled (FM_EN goes high) if the FMPLL is locked
(S_LOCK = 1), or when the modulation has been enabled (FM_EN = 1) and FMPLL enters lock state
(S_LOCK goes high).
Table 6-15. Progressive clock switching on pll_select rising edge
Number of FMPLL output clock cycles
FMPLL_clk frequency
(FMPLL output clock frequency)
8
(FMPLL output clock frequency)/8
16
(FMPLL output clock frequency)/4
32
(FMPLL output clock frequency)/2
onward
FMPLL output clock frequency
FMPLL output clock
FMPLL_clk
Division factors of 8, 4, 2 or 1
Содержание MPC5605BK
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