'87C451 PLCC' '80C451 PLCC' {X Size =} 15 {Y Size =} 42 {Parts per Package =} 1 L1 1 IN 'E\A\/VP' L3 53 IN 'XTAL1' R1 17 I/O 'P0.0/AD0' R2 16 I/O 'P0.1/AD1' R3 15 I/O 'P0.2/AD2' R4 14 I/O 'P0.3/AD3' R5 13 I/O 'P0.4/AD4' R6 12 I/O 'P0.5/AD5' R7 11 I/O 'P0.6/AD6' R8 10 I/O 'P0.7/AD7' R10 2 I/O 'P2.0/A8' R11 3 I/O 'P2.1/A9' R12 4 I/O 'P2.2/A10' R13 5 I/O 'P2.3/A11' R14 6 I/O 'P2.4/A12' R15 7 I/O 'P2.5/A13' R16 8 I/O 'P2.6/A14' R17 9 I/O 'P2.7/A15' T7 18 PWR 'VCC' B7 54 PWR 'GND' R19 67 OUT 'P\S\E\N\' R20 68 OUT 'ALE' R22 36 I/O 'P3.0/RXD' R23 37 I/O 'P3.1/TXD' R24 38 I/O 'P3.2/I\N\T\0\' R25 39 I/O 'P3.3/I\N\T\1\' R26 40 I/O 'P3.4/T0' R27 41 I/O 'P3.5/T1' R28 42 I/O 'P3.6/W\R\' R29 43 I/O 'P3.7/R\D\' R31 26 I/O 'P4.0' R32 25 I/O 'P4.1' R33 24 I/O 'P4.2' R34 23 I/O 'P4.3' R35 22 I/O 'P4.4' R36 21 I/O 'P4.5' R37 20 I/O 'P4.6' R38 19 I/O 'P4.7' L4 52 IN 'XTAL2' L7 35 IN 'RESET' L10 44 I/O 'P5.0' L11 45 I/O 'P5.1' L12 46 I/O 'P5.2' L13 47 I/O 'P5.3' L14 48 I/O 'P5.4' L15 49 I/O 'P5.5' L16 50 I/O 'P5.6' L17 51 I/O 'P5.7' L22 27 I/O 'P1.0' L23 28 I/O 'P1.1' L24 29 I/O 'P1.2' L25 30 I/O 'P1.3' L26 31 I/O 'P1.4' L27 32 I/O 'P1.5' L28 33 I/O 'P1.6' L29 34 I/O 'P1.7' L31 59 I/O 'P6.0' L32 60 I/O 'P6.1' L33 61 I/O 'P6.2' L34 62 I/O 'P6.3' L35 63 I/O 'P6.4' L36 64 I/O 'P6.5' L37 65 I/O 'P6.6' L38 66 I/O 'P6.7' R40 58 I/O 'AFLAG' R41 57 I/O 'BFLAG' L40 55 IN 'O\D\S\' L41 56 IN 'I\D\S\'