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Configuration Jumpers

The jumpers used to configure the MCBx51 board are:

NMI: Default ON

The NMI configuration jumper determines if the INT push-button is connected to the NMI pin on the Atmel AT/TSC80251G1 microcontroller.

  • ON: Pin 34 is connected to GND.
  • OFF: The INT push-button is connected to the NMI pin on the Atmel AT/TSC80251G1.

INT1: Default ON

The INT1 configuration jumper determines if the INT push-button is connected to port pin 3.3 on the microcontroller.

  • ON: The INT push-button is connected to port 3.3.
  • OFF: The INT push-button is not connected to port 3.3.

PAGE / NONP: Default NONP

These nine configuration jumpers determine if the MCBx51 board operates in page mode or non-page mode.

  • PAGE: When these jumpers are in the PAGE position, the address/data bus is configured for 251/151 page mode. The data and upper address byte are multiplexed on port 2 (this mode is available only on the 251/151).
  • NONP: When the jumpers are in the NONP position, the standard 8051 bus or 251/151 non-page mode is selected. The data and lower address byte are multiplexed on port 0 (this mode is available on the 251, 151, and 8051).

The PAGE/NONP jumper setting must be set to match up with the CPU CONFIG BYTE settings. Refer to the 251 or 151 data sheets for more information about these modes.

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