 MCBx51 User's Guide | |
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MCBx51 User's Guide
Introduction Setup
Board Setup Board Components Connecting the MCBx51 Configuring the MCBx51 DIP Switches Configuration Jumpers Monitor Modes Monitor Status Display Microcontroller Selection Theory of Operation 251 Devices 8051 DevicesConfiguration 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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