Figure 7. Buttons
2.2 Oscillator control
Oscillator Control
controls the generation of the external oscillator (XOSC) frequency. MPC5746R supports two ways of XOSC
generation. The chip has two external oscillator pins,
XTAL
and
EXTAL
. An 8-40 MHz external oscillator can be connected to both
pins. This external oscillator is also referred to simply as
XTAL
. If the
XOSC 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. This signal
is also referred to simply as
EXTAL
. When the
XOSC Select
block selects
EXTAL
, XOSC will derive its frequency from the
EXTAL
pin. Shown below is a screenshot.
Figure 8. Oscillator control
NXP Semiconductors
Clock calculator design
MPC574xR Clock Calculator Guide, Rev. 5, October 2018
Application Note
6 / 28
