Dynamic windowing readout and image transposition are significant functions of large format focal plane imaging detector, and also it is necessary to realize low power consumption. Based on the standard digital circuit design process, a new counter based on Gray code was designed to access the row and column address. The RTL simulation results show that the proposed design can achieve the functions of dynamic windowing readout and dynamic image transposition. A TSMC 90-nm process with 3.3V supply voltage was used to implement a 1024×1024 design, and it concluded that the power consumption of the addressing counter is only 19.56μW and the overall design power is only 58.75μW. This design is suitable for the design of readout circuit of large format focal plane system.