INTEGRATED CIRCUITS P87C554 80C51 8-bit microcontroller 12 clock operation 2 16K/512 OTP/RAM 8 channel 10-bit A/D, I C, PWM, capture/compare, high I/O Product data 2002 Mar 25 Supersedes data of 1998 Aug 14 Philips Semiconductors Product data 80C51 8-bit microcontroller 12 clock operation 2 P87C554 16K/512 OTP/RAM, 8 channel 10-bit A/D, I C, PWM, capture/compare, high I/O DESCRIPTION 1 FEATURES . 1 ORDERING INFORMATION . 2 PART NUMBER DERIVATION . 2 BLOCK DIAGRAM . 2 PINNING INFORMATION . 3 Plastic Leaded Chip Carrier pin functions . 3 LOGIC SYMBOL . 3 PIN DESCRIPTION . 4 SPECIAL FUNCTION REGISTERS . 6 OSCILLATOR CHARACTERISTICS 8 RESET . 8 LOW POWER MODES . 8 Stop Clock Mode 8 Idle Mode . 8 Power-Down Mode 8 POWER OFF FLAG 9 Design Consideration 9 ONCEE Mode . 9 Reduced EMI Mode 9 Expanded Data RAM Addressing 10 Dual DPTR . 11 DPTR Instructions . 11 Enhanced UART . 13 Automatic Address Recognition . 13 Timer T2 . 15 Timer T3, The Watchdog Timer . 20 Serial I/O 21 Port 5 Operation 21 Pulse Width Modulated Outputs . 21 Analog-to-Digital Converter . 21 Power Reduction Modes . 26 Interrupts 28 ABSOLUTE MAXIMUM RATINGS . 61 DEVICE SPECIFICATIONS 61 DC ELECTRICAL CHARACTERISTICS 62 AC ELECTRICAL CHARACTERISTICS 65 EXPLANATION OF THE AC SYMBOLS 67 EPROM CHARACTERISTICS . 72 Program Verification 72 Security Bits 72 REVISION HISTORY . 74 i 2002 Mar 25