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how to connect u1 and ic1 to enter to isp mode
2y
To enter ISP (In-System Programming) mode using the LPC2148 (U1) and the CP2102N (IC1), you need to set up a UART communication link between them. Since the CP2102N is a USB to UART bridge, it will enable your LPC2148 to communicate with a PC for ISP operations. Here's how you can connect them for ISP mode:
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Power Connections:
- Ensure both U1 and IC1 are powered correctly. U1's VDD ((V_{DD})) pins should be connected to a regulated +3.3V power supply, as should IC1's VDD pin.
- Ground (GND) pins of both IC1 and U1 should be connected together to a common ground.
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UART Connections:
- The CP2102N's TXD pin is meant to transmit data to U1, so connect IC1:TXD (pin 26) to U1's receiver pin for UART0, which is typically P0.0 (pin 19). However, LPC2148 uses P0.1 (pin 21) for UART0's receive function (RXD0) based on its User Manual. Use the correct pin for UART reception as per your microcontroller's datasheet.
- Connect IC1:RXD (pin 25) to the appropriate UART0 transmit pin on U1, which is P0.0 (pin 19). Again, ensure to check the datasheet; LPC2148 uses P0.0 for UART0's transmit function (TXD0).
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ISP Mode Activation:
- For LPC2148, entering ISP mode requires pulling P0.14 to LOW during reset. Connect a pull-down resistor (typically 10kΩ) to P0.14 (pin 41) and ground.
- You then need a way to reset U1 while P0.14 is LOW. This can be done by momentarily connecting the ~RESET pin (pin 57) to ground either manually or through a switch.
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Optional Connections:
- If you need USB connectivity from your PC to IC1 for power or communication, ensure you've connected IC1's USB pins to a micro-USB connector appropriately (D+ to D+, D- to D-, and GND to Ground).
Here are the summarized connections:
- Connect U1:VDD, IC1:VDD to +3.3V, and U1:VSS, IC1:GND to common ground.
- Connect IC1:TXD (pin 26) to U1:P0.1 (pin 21) for UART0 RXD.
- Connect IC1:RXD (pin 25) to U1:P0.0 (pin 19) for UART0 TXD.
- Connect a 10kΩ pull-down resistor from U1:P0.14 (pin 41) to ground for ISP mode entry.
- Momentarily connect U1:~RESET (pin 57) to ground for resetting the device into ISP mode.
These steps assume typical values and configurations for entering the ISP mode. Please consult the datasheets for both U1 (NXP LPC2148) and IC1 (Silicon Labs CP2102N) to adjust for any specific requirements or variations in the setup.
2y
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U1
IC1
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Properties
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Power Connections:
- Connect U1:23 (VDD) to IC1:6 (VDD) for powering the microcontroller.
- Connect U1:49 (VBAT) to U1:23 (VDD) to supply power to the RTC and the internal registers.
- Ensure all U1 and IC1 GND pins (U1:6, U1:18, U1:25, U1:42, U1:50, U1:59, and IC1:3, IC1:29) are connected to the common ground.
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USB Data Lines to CP2102N:
- Connect U1:10 (D+) to IC1:4 (D+), and U1:11 (D-) to IC1:5 (D-) for USB data lines.
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UART Connection for ISP:
- Connect U1:P0.0 (U1:19) to IC1:TXD (IC1:26) for TX.
- Connect U1:P0.1 (U1:21) to IC1:RXD (IC1:25) for RX.
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Entering ISP Mode:
- To enter ISP mode, P0.14 (U1:41) must be pulled LOW during reset. You can connect a momentary push button between P0.14 and GND. Make sure you add a pull-up resistor (about 10k ohms) between P0.14 (U1:41) and VDD (U1:23) to ensure it defaults to HIGH.
- Connect a momentary push button or a reset circuit to ~RESET (U1:57) that when pressed, pulls ~RESET low. This initiates the microcontroller reset sequence.
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Power Supply:
- The CP2102N’s VREGIN (IC1:7) should be connected to a +5V supply if you're not powering the CP2102N directly from USB.
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Additional Connections for Usability:
- It's a good practice to connect the CP2102N ~RST (IC1:9) to a pull-up resistor (about 10k ohms) to ensure it is not inadvertently reset. This is not strictly required for ISP but is good for stability.
Summary Connections: