Keil™, An ARM® Company

MCB2103 User's Guide

Jumper Descriptions

The jumpers used to configure the MCB2103 board are:

  • J1 - ISP: Enable for In-System Programming: lets the RTS line of the COM0 port generate a signal on P0.14 (EINT1). When RTS is active P0.14 is driven low. This is used to enter In-System Programming (ISP) mode.
  • J2 - AV: Analog Voltage for AD0: connects the POT1 potentiometer to the analog input AD0.
  • J3 - 3.3V: Supply Voltage for CPU: connects the 3.3V supply voltage to VDD3 of the CPU.
  • J4 - V1.8V: Supply Voltage for CPU: connects the 1.8V battery supply voltage to the CPU.
  • J5 - VDDA: Supply Voltage for CPU: connects the 3.3V supply voltage to the CPU Analog Reference Input VDDA.
  • J6 - Enable LED Driver: enables the LED driver connecting the on-board LEDs to GPIO Port0.16 - Port0.23.
  • J7 - INT1: Enable Push Button INT1: connects the push button INT1 to the CPU I/O pin P0.14 (EINT1 input).  Pushing the button generates a low signal.
  • J9 - JTAG: Enable JTAG Interface: enables the JTAG interface. This jumper is required for ISP flashing and for debugging via Keil ULINK or other JTAG debuggers.
  • J10 - RST: Enable Reset via COM0 Port: When RST is set, you may generate a CPU RESET signal using the DTR signal of the COM0 port. An active DTR signal generates a CPU RESET.