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Text: D E VE LO PM EN T DATA This data sheet contains advance inform ation and PCF84C121 specifications are subject to change w ith out notice. SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 8 BYTES EEPROM DESCRIPTION An advanced CMOS process is used to manufacture the PCF84C121. The PCF84C121 has 13 quasibidirectional I/O port lines, three single-level vectored interrupts one external and tw o tim er , 8 bytes