SLAU802 March 2019
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MSP430FR2476 LaunchPad™ Development Kit (LP‑MSP430FR2476)
- Trademarks
- 1 Getting Started
- 2 Hardware
- 3 Software Examples
- 4 Resources
- 5 FAQ
- 6 Schematics
2.2.3 Debug Probe Connection: Isolation Jumper Block
The isolation jumper block at jumper J101 lets you connect or disconnect signals that cross from the eZ-FET domain into the MSP430FR2476 target domain. This includes eZ-FET Spy-Bi-Wire signals, application UART signals, and 3.3-V and 5-V power.
Reasons to open these connections:
- To remove any and all influence from the eZ-FET debug probe for high accuracy target power measurements
- To control 3-V and 5-V power flow between the eZ-FET and target domains
- To expose the target MCU pins for uses other than onboard debugging and application UART communication
- To expose the programming and UART interface of the eZ-FET to use it for devices other than the onboard MCU
- To select the CR2032 battery holder as the 3-V source
Table 2. Isolation Block Connections
| Jumper | Description |
|---|---|
| GND | Ground |
| 5V | 5-V VBUS from USB |
| 3V3 | 3.3-V rail, derived from VBUS in the eZ-FET domain or 3V rail derived from CR2032 battery |
| RXD << | Backchannel UART: The target FR2476 receives data through this signal. The arrows indicate the direction of the signal. |
| TXD >> | Backchannel UART: The target FR2476 sends data through this signal. The arrows indicate the direction of the signal. |
| SBW RST | Spy-Bi-Wire debug: SBWTDIO data signal. This pin also functions as the RST signal (active low). |
| SBW TST | Spy-Bi-Wire debug: SBWTCK clock signal. This pin also functions as the TST signal. |
Figure 6. eZ-FET Isolation Jumper Block Diagram