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Radiation-Hardened MicroController

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APPENDIX B

Impact of External Program ROM

The 8051 family of microcontrollers, including the industry

standards, use ports 0 and 2 to access external memory. In

implementations with external program memory, these two ports

are dedicated to the program ROM interface and can not be used

as Input/Output ports. The UT69RH051 uses external program

ROM, so ports 0 and 2 will not be available for I/O.

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