Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain project
Write a project description
Find schematic issues
Create a test plan
Simulate a circuit
Prepare for Manufacturing
Component Selection Workflow
New Subsystem Wizard

Ready.

Sign up to send
design for isp
b

bhagat

@copilot design for isp
2y

copilot

To design an In-System Programming (ISP) interface for the LPC2148 (U1), you typically need to connect a few specific pins on the microcontroller to an ISP programmer. This interface is used for programming the microcontroller directly through your circuit without needing to remove it. The LPC2148 uses a serial interface for ISP, which involves the following connections:
Required LPC2148 Pins for ISP:
  • P0.14 (Pin 41): Serial Clock (SCK)
  • P0.15 (Pin 45): Serial Data Input (SDI)
  • P0.17 (Pin 47): Serial Data Output (SDO)
  • P0.16 (Pin 46): Serial Peripheral Select (SPS)
  • ~RESET (Pin 57): Reset
Additional Connections:
  • VDD (Pins 7, 23, 43, 51): Connect to +3.3V power supply.
  • VSS (Pins 6, 18, 25, 42, 50, 59): Connect to Ground (GND).
  • VTREF (Pin 63): Connect to +3.3V (As it sets the reference voltage for the JTAG interface, and typically JTAG and ISP share some pins or setup conditions).
  • VBAT (Pin 49): Connect to +3.3V if RTC functionality is used, otherwise can be connected to VDD or left unconnected based on your application.
  • ~RESET (Pin 57): It is often useful to include an external pull-up resistor (e.g., 10KΩ) to +3.3V and a capacitor (e.g., 100nF) to GND to ensure a stable reset line. You might also want to add a pushbutton to ground to manually reset your microcontroller.
ISP Connections:
  • Connect a 6-pin header to the pins mentioned for ISP (you may use a standard 10-pin IDC for ARM microcontrollers if you plan on also using JTAG for debugging, which includes ISP pins).
Suggested Connections for ISP:
  • Connect ISP Header Pin 1 (SCK) to U1:P0.14.
  • Connect ISP Header Pin 2 (SDI) to U1:P0.15.
  • Connect ISP Header Pin 3 (SDO) to U1:P0.17.
  • Connect ISP Header Pin 4 (SPS) to U1:P0.16.
  • Connect ISP Header Pin 5 (VDD) to U1:VDD (You can choose any of the VDD pins on the LPC2148).
  • Connect ISP Header Pin 6 (GND) to U1:VSS (Any VSS pin can be used).
Please remember that the precise pinout for your ISP header might vary based on the ISP programmer you are using. The connections outlined above facilitate basic communication for programming. If your programmer defines a different pinout or requires additional markings (like pin 1 indicator), please adjust accordingly.
ISP programming can be initiated by pulling the ~RESET pin low while applying a specific sequence to the serial interface, as per the LPC2148's datasheet or user manual provided by NXP. Always refer to the latest documentation for your microcontroller for detailed programming procedures and ISP command sets.
2y
1
U1

No results...

Learn to Add a Component#request-a-part on Slack
Nutty Blue Antigravity Battle Room thumbnail
Welcome to your new project. Imagine what you can build here.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Assets

No assets added.

Controls