80C451/83C451/87C451 80C51 8-bit Microcontroller Family 4K/128 OTP/ROM/ROMless, Expanded I/O

The Philips 8XC451 is an I/O expanded single-chip Microcontroller fabricated with Philips high-density CMOS technology. Philips epitaxial substrate minimizes latch-up sensitivity. The 8XC451 (includes the 80C451 87C451 and 83C451 is a functional extension of the 87C51 Microcontroller with three additional I/O ports and four I/O control lines for a total of 68 pins. Four control lines associated with port 6 facilitate high-speed asynchronous I/O functions. The 8XC451 includes a 4k 8 ROM 83C451 EPROM 87C451 , a 128 8 RAM, 56 I/O, two 16-bit Timer Counters a five source, two priority level, nested interrupt structure, a serial I/O port for either a full duplex UART I/O expansion, or multi-processor Communications and on-chip Oscillator and Clock circuits. The 80C451 ROMless version includes all of the 83C451 features except the on-board 4k 8 ROM. The 87C451 has 4k of EPROM on-chip as program memory and is otherwise identical to the 83C451. The 8XC451 has two software selectable modes of reduced activity for further power reduction; idle mode and power-down mode. Idle mode freezes the CPU while allowing the RAM, Timers serial port, and interrupt system to continue functioning. Power-down mode freezes the Oscillator causing all other chip functions to be inoperative while maintaining the RAM contents.
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80C451 Pinout, Pinouts
80C451 pinout,Pin out
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