ATmega128. External Memory Control Register B –. XMCRB. XMBK. XMM2. XMM1. XMM0. • Bit 7– XMBK: External Memory Bus-keeper Enable - Datasheet ATmega128, ATmega128L - Complete Atmel
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ATMEGA128-16AUR - Microchip - 8 Bit MCU, Low Power High Performance, AVR ATmega Family ATmega128 Series Microcontrollers
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