AT89C51AC3(PLCC44) ADP-89C51CC01-PL No Need WASIG V5.65 ATMEL MPU/MCU AT89C51AC3(PLCC52) ADP-89C51CC03-PL52 No Need WASIG V5.65 ATMEL MPU/MCU AT89C51AC3(QFP44) ADP-89C51CC01-TQ No Need WASIG V5.65 ATMEL MPU/MCU AT89C51AC3(QFP64) ADP-89C51CC03-Q64 No Need WASIG V5.65 ATMEL MPU/MCU AT89C51CC03(PLCC44) ADP-89C51CC01-PL No Need WASIG V5.65 ATMEL MPU/MCU AT89C51CC03(PLCC52) ADP-89C51CC03-PL52 No Need WASIG V5.65 ATMEL
periodes except during an external data memory access EA 51 24 I External Access Enable When held at high level, instructions are fetched from the internal ROM (SAB 83C517A-5 only) when the PC is less than 8000H. When held at low level, the SAB 80C517A fetches all instructions from ex- ternal program