AM625 datasheet(110/235 Pages) TI

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SYSCLKOUT0

OBSCLK0

CLKOUT0

CLK4

CLK5

CLK6

CLK7

CLK8

CLK9

CLK10

CLK11

CLK12

MCU_SYSCLKOUT0

CLK13

CLK14

CLK15

MCU_OBSCLK0

CLK16

CLK17

CLK18

Figure 7-15. Clock Switching Characteristics

7.10.4 Clock Specifications

7.10.4.1 Input Clocks / Oscillators

Various external clock inputs/outputs are needed to drive the device. Summary of these input clock signals is as

follows:

• MCU_OSC0_XO/MCU_OSC0_XI — Еxternal main crystal interface pins connected to internal oscillator

which sources reference clock and provides reference clock to PLLs within MAIN domain.

• General purpose clock inputs

– MCU_EXT_REFCLK0 — optional external. Provides system clock input (MCU domain).

– EXT_REFCLK1 — optional external System clock input (MAIN domain). Optionally PLL2 (PER1) and

MCASP can be sourced by EXT_REFCLK1 (sourced externally).

• External CPTS reference clock inputs

– CP_GEMAC_CPTS0_RFT_CLK — CPTS reference clock inputs for CP_GEMAC_CPTS0_RFT_CLK.

For more information about Input clock interfaces, see Clocking section in Device Configuration chapter in the

device TRM.

7.10.4.1.1 MCU_OSC0 Internal Oscillator Clock Source

Figure 7-16 shows the recommended crystal circuit. All discrete components used to implement the oscillator

circuit should be placed as close as possible to the MCU_OSC0_XI and MCU_OSC0_XO pins.

AM625, AM623

SPRSP58 – JUNE 2022

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