P87CL54X2

NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section of this specification is not implied.
2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted.

The Philips P87CL5xX2 is a high-performance static 80C51 design fabricated with Philips high-density CMOS technology with operation from 1.8 V to 3.3 V.

The P87CL5xX2 ROMless devices contain a 256 * 8 RAM, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and on-chip oscillator and clock circuits.

In addition, the P87CL5xX2 is a low power static design which offers a wide range of operating frequencies down to zero. Two software selectable modes of power reduction - idle mode and power-down mode - are available. The idle mode freezes the CPU while allowing the RAM, time rs, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative. Since the design is static, the clock of P87CL5xX2 can be stopped without loss of user data and then the execution resumed from the point the clock was stopped.