87C51SL Datasheet PDF

Intel 87C51SL

The active-low host-interface write signal RDL I The active-low host-interface read signal CSL I The active-low host-interface chip select A0 – A1 I Host-Interface Address select inputs PCOBF O The active-high host-interface Output Buffer Full interrupt GATEA20 O Gate A20 control signal output RCL PROGL O Host reset active low This pin is also the program pulse input during EPROM programming LED0 – 3 O LED output drivers KSI0 – 7 I Keyboard input scan lines (input Port 0) Schmitt inputs with 5K – 20K pull-up resistors KSO0 – 15 O Keyboard output scan lines PORT 1 P10 A0– P17 A7 I O Port 1 is...