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MSP430FR2476 Proto Board

For testing devices of family SLAU445.

The proto-board for the MSP430FR2476 family is target for the newer FRAM devices with LQFP48. There are not so many options with this pin-out, but FRAM changes JTAG operations quite a lot, so it is worth the investment for the development of a embracing MSPBMP firmware.

This board offers many configuration options as these chips support JTAG and SBW and many reserved pins for legacy parts can now operate as GPIO. Then you have more jumpers and solder jumpers than on other prototype boards.

The pictures shows a 3D model of this prototype board:

FR2476.png

These are the features:

  • Support for a couple of LQFP48 FRAM parts: the MSP430FR2475, MSP430FR2476, MSP430FR2675 and MSP430FR2676.
  • Standard 14-pin JTAG connector
  • Configurable support for JTAG and Spi By Wire. SBW can be configured for standard TI emulators and Olimex MSP430-JTAG-Tiny-V2 emulators.
  • Serial port on the JTAG connector.
  • Support for power supply from JTAG connector or internal 3.3V regulator using a Micro USB cable.
  • Configurable use of a 16 MHz crystal.
  • Reset button.
  • Configurable use of analog voltage (ADC support).
  • Test led on P4.1 configurable by jumper.
  • Al IO ports wired to accessible header pins.
  • Header pins for VCC, USB +5V and GND.

Top PCB view

FR2476-brd.top.svg

Bottom PCB view

FR2476-brd.bottom.svg

Users Guide

The following points describes general use of these boards.

External USB power supply

To use the external power supply connect a powered µUSB cable into J4. For this case the switch SW1 will control the power.

Before connecting a JTAG cable into J12, ensure that the VSEL jumper shorts the Vref position.

Vref.png

Powering from the JTAG tool

During most simple tests with the board the best option is to power it from the JTAG emulator.

For this option just connect the JTAG tool to the J12 JTAG connector and move the jumper on VSEL to the Vtool position. When the JTAG is connected and running it will supply the board with its internal power supply.

Vtool.png

Note that the switch SW1 and the +5V jumper has no effect on this configuration.

Selecting JTAG or SBW Modes

Since pin-outs may differ for different debug emulators the board offers three different options in the J5 jumper.

The silk screen indicates three jumpers that needs to be shorted for the standard JTAG interface. Actually JTAG requires a fourth jumper, which is the last one, shared with Olimex marking.

If you choose Spy-By-Wire, then you have two options: The silk-screen at the center indicates two jumpers for the standard TI connection or two jumpers for the Olimex MSP430-JTAG-Tiny-V2 emulators.

These options are mutually exclusive: do not connect multiple options at the same time.

JTAG Configuration

For the JTAG mode the four jumpers connects the following pins:

  • TDO --> TDO (P1.7)
  • TCK --> TCK (P1.4)
  • RST --> RESET
  • TEST --> TEST

JTAG.png

Spy-By-Wire Configuration - TI pin-out

TI SBW uses the following connections:

  • TDO --> RESET
  • TCK --> TEST

SBW-TI.png

The MSPBMP device uses the TI pin layout.

Spy-By-Wire Configuration - Olimex pin-out

Olimex SBW uses the following connections:

  • RST --> RESET
  • TEST --> TEST

SBW-OL.png

Reset Button

The Reset button can be used to restart the device. It is not advised to interrupt a running JTAG connection by pressing this button. Some references states that MCU may enter an undefined state.

Attaching the Crystal

The crystal is by default not connected, since pins may be configured as a general GPIO port. To enable this function, short both solder bridges marked with the XTAL label.

Analog Power Supply

The Analog supply pins are configurable as GPIO pins. To enable them as power source short both solder jumpers AVCC and AGND. In this case ensure not to set the pins with the GPIO function.

Other Voltage Supplies

The board exposes all power supplies through jumpers. It is advised to follow good practice rules, as there are no kind of protection. The +5V pins are connected to a USB bus or power adapter. Low quality power sources may be a cause of issues.

Using the LED function

To use the LED, just connect the LED_P4.1 jumper.

LED.png

A test program for the LED test could be:

#include <msp430.h>

void Delay()
{
	long counter = 0;
	while (counter++ < 5000)
		asm("nop");
}

void MainLoop()
{
	WDTCTL = WDTPW | WDTHOLD;
	
	P4DIR |= (1 << 1);
	
	for (;;)
	{
		P4OUT |= (1 << 1);
		Delay();
		P4OUT &= ~(1 << 1);
		Delay();
	}
}

int main()
{
	MainLoop();
}