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Jumper Descriptions

The jumpers used to configure the MCB2140 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 AIN0: connects the POT1 potentiometer to the analog input AIN0.
  • J3 - 3.3V: Supply Voltage for CPU: connects the 3.3V Supply Voltage to the CPU.
  • J4 - VBAT: Supply Voltage for CPU: connects battery Supply Voltage to the CPU.
  • J5 - V3A: Analog Reference Voltage for CPU: connects the 3.3V Supply Voltage to the CPU Analog Reference Input V3A.
  • J6 - LED: Enable LED Driver: enables the LED driver connecting the on-board LEDs to GPIO Port1.16 - Port1.23.
  • 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.
  • J8 - ETM: Enable Embedded Trace Module: enables the Embedded Trace Module (ETM). Port1.16 - Port1.23 LEDs cannot be used when J8 is set because these pins share the same ETM signals.
  • J9 - JTAG: Enable JTAG Interface: enables the JTAG interface. This 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.
  • J11 - VREF: A/D Converter Reference Voltage: connects 3.3V Supply Voltage VREF of the CPU. 
  • J12 - D-: USB Line: connect the USB Line D- to the USB connector.
  • J13 - AOUT: D/A Output for loudspeaker: connects the AOUT output to the LF amplifier.
  • J14 - D+: USB Line: connect the USB Line D+ to the USB connector.
  • J15 - VR: Vbus signal:connects 5V supply from the USB connector to the Vbus pin (P0.23), indicating the presence of USB BUS power to the device.
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