LS1012A datasheet(30/39 Pages) NXP

30 / 39 page

This section describes the MBED circuit on the FRWY-LS1012A. MBED is an open

standard serial and debug adapter. It bridges serial and debug communications between a

USB host and an embedded target processor, as shown in the figure below.

LS1012A

nRESET

K20 MCU

MSD

bootloader

CMSIS-DAP

application

UART0 Tx/Rx

JTAG signals

GPIO

UART Tx/Rx

GPIO

OpenSDA CMSIS-DAP

USB host

USB

Figure 2-11. CMSIS-DAP

CMSIS-DAP is managed by a Kinetis K20 MCU built on the Arm Cortex-M4 core. The

Kinetis K20 includes an integrated USB controller (USB 2.0 Micro-AB) port that can

operate at clock rates of up to 120 MHz. The CMSIS-DAP circuit includes a status LED.

In addition, signal connections are available to implement a UART serial channel.

CMSIS-DAP features a mass storage device (MSD) boot loader, which provides a quick

and easy mechanism for loading different CMSIS-DAP applications, such as flash

programmers, run control debug interfaces, serial-to-USB converters.

2.17 GPIO pins

On the FRWY-LS1012A board, 1 GPIO pin is connected to the mikroBUS connector.

Table 2-12. FRWY-LS1012A - GPIO mapping

Primary function

GPIO function

Connections on FRWY-LS1012A board

SDHC1_WP

uBUS_GPIO_1[22]

Connects LS1012A to the mikroBus connector on AN pin via

translator

GPIO pins

Layerscape LS1012A Freeway (FRWY-LS1012A) Board Reference Manual, Rev. 0, 04/2018

NXP Semiconductors

LS1012A Datasheet(PDF) 30 Page - NXP Semiconductors