P80CL51

INTEGRATED CIRCUITS DATA SHEET P80CL31; P80CL51 Low voltage 8-bit microcontrollers with UART Product specification Supersedes data of January 1995 File under Integrated circuits, IC20 1997 Apr 15 Philips Semiconductors Product specification Low voltage 8-bit microcontrollers with UART CONTENTS 1 2 2.1 3 4 5 6 7 7.1 7.2 8 8.1 8.2 9 9.1 9.2 9.3 9.4 10 10.1 10.2 10.3 10.4 11 12 12.1 12.2 12.3 12.4 12.5 13 13.1 13.2 FEATURES GENERAL DESCRIPTION Versions: P80CL31 and P80C51 APPLICATIONS ORDERING INFORMATION BLOCK DIAGRAM FUNCTIONAL DIAGRAM PINNING INFORMATION Pinning Pin description FUNCTIONAL DESCRIPTION OVERVIEW General CPU timing MEMORY ORGANIZATION Program Memory Data Memory Special Function Registers (SFRs) Addressing I/O FACILITIES Ports Port options Port 0 options SET/RESET options TIMERS/EVENT COUNTERS REDUCED POWER MODES Idle mode Power-down mode Wake-up from Power-down mode Power Control Register (PCON) Status of external pins STANDARD SERIAL INTERFACE SIO0: UART Multiprocessor communications Serial Port Control and Status Register (S0CON) 25 26 26.1 26.2 26.3 27 28 13.3 14 14.1 14.2 14.3 15 16 16.1 16.2 17 17.1 17.2 18 19 20 21 22 23 24 24.1 24.2 24.3 Baud rates P80CL31; P80CL51 INTERRUPT SYSTEM External interrupts INT2 to INT9 Interrupt priority Interrupt registers OSCILLATOR CIRCUITRY RESET External reset using the RST pin Power-on-reset MASK OPTIONS FOR P80CL31 AND P80C51 P80CL31: ROMless version P80C51: 5V standard version SPECIAL FUNCTION REGISTERS OVERVIEW IN...