Clock calculator design
MPC5777C Clock Calculator Guide, Rev. 1, 12/2018
8 NXP Semiconductors
2.3.
Oscillator control
Oscillator Control controls the generation of the external oscillator (XOSC) frequency. MPC5777C
supports two ways of XOSC generation. The chip has two external oscillator pins, XTAL and EXTAL.
An 8-44 MHz external oscillator can be connected to both pins. This external oscillator is also referred
to simply as XTAL. If the XOSC Enable/Select block selects XTAL, XOSC will derive its frequency from
the external oscillator (XTAL) block. Alternatively, a waveform can be driven directly to the EXTAL
pin, also known as bypass mode. This signal is also referred to simply as EXTAL. When the XOSC
Enable/Select block selects EXTAL, XOSC will derive its frequency from the EXTAL pin. Shown below
is a screenshot of oscillator control.
Figure 9. Oscillator control
2.4.
Peripheral domains
Peripheral Domains is an in-depth diagram of MPC5777C modules. Where Tree leaves off at the clock
domain level, Peripheral Domains picks up and progresses to the module level, as shown in the figure
below.
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