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User Guide V0.90
The following target system requirements must be met for the GEMINI-1 programmer to
operate correctly :
• Target oscillator
The target microcontroller oscillator must be running between certain prescribed
frequencies. These can be found in the relevant microcontroller data sheets.
• Power
The GEMINI-1 requires a regulated DC supply to operate. This supply can be taken either
from the user target system or an external power supply unit (PSU). The programmer
should operate correctly between the specified operating voltage limits (see hardware
specifications).
• RESET circuit
The serial programming mode of the Philips FLASH microcontroller devices is initiated by
asserting the RESET pin in the correct sense for a certain period of time. The programmer
must, therefore, be able to assert the RESET pin on the user target microcontroller.
External control of the RESET pin can be implemented in a number of different ways.
Target System Requirements
