SLVUDH9 March   2026

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Hardware Description
    2. 2.2 Power Requirements
      1. 2.2.1 Power Tree
        1. 2.2.1.1 On-Board Power Supplies
        2. 2.2.1.2 Analog Voltage Reference
        3. 2.2.1.3 Alternative Power Sources
          1. 2.2.1.3.1 USB Isolation
          2. 2.2.1.3.2 External Power Connections
          3. 2.2.1.3.3 5V Step-Up Converter
      2. 2.2.2 Power Indicator LEDs
    3. 2.3 Reset
    4. 2.4 Clock
    5. 2.5 Interfaces
      1. 2.5.1 User LEDs
      2. 2.5.2 MCAN
      3. 2.5.3 Encoder Connectors
    6. 2.6 Debug Interface
      1. 2.6.1 XDS110 Debug Probe
      2. 2.6.2 Virtual COM Port
      3. 2.6.3 ARM 10-Pin Debug Header
    7. 2.7 Test Points
    8. 2.8 BoosterPacks
  9. 3Additional Information
    1. 3.1 Revision E1 Appendix
      1. 3.1.1 Revision E1 Known Issues
    2. 3.2 Revision E2 Appendix
      1. 3.2.1 Revision E2 Changes from E1
    3. 3.3 Trademarks

2.4 Clock

Input Clock

The AM13E230x MCU default clock source on the LaunchPad is a 25MHz crystal oscillator (Y1) connected to the X1 and X2 pins of the MCU, and is referred to as XTAL. Alternatively, a high frequency digital clock input ranging from 4-48MHz can be connected to J14, and is referred to as HFCLK_IN.

In order for HFCLK_IN to be the main external oscillator input, there are a few hardware modifications required to the LaunchPad:

  1. Remove R1 and R18 to disconnect the XTAL (Y1) from the X1 and X2 pins of the MCU
  2. Populate R19 to connect the HFCLK_IN header (J14) to the X1 pin of the MCU
  3. Connect a high frequency digital clock input to J14
LP-AM13E230 LP-AM13E230 Clock Input Figure 2-6 LP-AM13E230 Clock Input

Output Clock

The AM13E230x MCU CLKOUT pin is accessible on header J15. The external clock output is useful for clocking external circuitry such as an external ADC that does not have a clock source. The clock output unit on the AM13E230x MCU has several sources and a programmable clock divider. For information on configuring the CLKOUT unit, refer to the Technical Reference Manual.