TP8051AH - MCS51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS

of Intel’s thermal impedance test methodology.

Do not connect PI.’ P1.1 P1.2 P1.3 P1.4 P1.5 P1,6 P1.7 RST RU2 P3.O TXD P3.1 INTO P3.2 INT1 P3,3 TOP3 4 11 P3.5 ~ P3.6 t% P3.7 XTAL2 XTAL1 I

• of the MCS 51 Family, as listed below: written to them are pulled high by the internal pullDataSheet4U. com UPS,and in that state can be used as inputs. As inputs, Port 1 pins that are externally pulled low will Port Alternative Function source current (IIL on the data sheet) because of the Pin internal pullups. RXD (serial input port) P3,0 Port 1 also receives the low-order address bytes P3.1 TXD (serial output port) during programming of the EPROM parts and during INTO(external interrupt O) P3.