P89C51X2

The Philips microcontrollers described in this data sheet are high-performance static 80C51 designs. They are manufactured in an advanced CMOS process and contain a non-volatile Flash program memory. P89C51X2 and P89C52X2/54X2/58X2 support both 12-clock and 6-clock operation.

The P89C51X2 and P89C52X2/54X2/58X2 contain 128 byte RAM and 256 byte RAM respectively, 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 P89C51X2 and P89C52X2/54X2/58X2 are static designs which offer 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, timers, 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 P89C51X2 and P89C52X2/54X2/58X2 can be stopped without loss of user data. Then the execution can be resumed from the point the clock was stopped.