I recently bought This MCU and in another question asked how I could flash it. The response was to use a USB to serial Connector (which I wanted to find on newark.com but could not). I wanted to know if I could solder This microUSB female connector to the io pins of my MCU and be able to flash the MCU to over microUSB from my raspberry pi. Can I?
You can't use a USB connector to download code to one of those ARM chips, the flash bootloader uses the UART.
I've used one of these USB to serial adapters:
with Flash Magic to download code to an LPC810 chip via the UART connections. You have to connect a pin to ground when applying power to enable flash downloading, details will be in the data sheet.
This is possible to flash microcontroller using USB to Serial Converter using FLASH MAGIC tool. Here is article this might help you: Flashing MCU over Serial Cable
You can use secondary boot loader to flash MCU using Rashpberry Pi over microUSB Secondary bootloader video to flash MCU over USB