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Users Manual TOPAS900 Flash V2.1
HWU Elektronik Oberhausen Page 15
and Debugging Board, the jumper can be left open – the line is controlled by the firmware
controller.
If the Flash Carrier Board works stand-alone (without Programming-and-Debugging
Board), the jumper must be set when external flash software should be executed. If the
jumper is left open, the /EA pin is pulled up by a 10k pull-up resistor and the Flash MCU
boots from internal flash memory. When the MCU is reset with /EA at high level, the
external memory can be accessed additionally. The entire ROM size would be 768 kb and
128 kb of RAM. When the MCU is reset with /EA at low level, the internal flash ROM
cannot be accessed additionally.