The P-51 "Peripheral 8051" is a new concept: An 8051 with built-in (E)ISA or PC-104 interface and supporting subsystems. These include downloadable Code RAM, dual port RAM, and all eleven IRQs to the host. Unlike classical 8051s, the P-51 naturally and easily interfaces to a host through simple standard buses, and its microsecond timing can provide real-time response to Windows applications.

P-51 Features

All 8051/52 resources:

• 8K bytes downloadable Code RAM.
• 256 bytes internal Data RAM.
• Timers 0, 1, and 2.
• Ports 0, 1, 2, and 3.
• All 8051 instructions.
• All 8051-equivalent Pins.
• Download Code RAM while reset.
• Execute Code when released.

EISA/PC-104 interface:

• 45 EISA signals supported.
• Uses one of 11 IRQ pins.
• Software selectable IRQ 3-15.
• 20 ISA Address pins.
• 8 ISA Data Bus pins.
• Hardware or software Reset.
• Select Segment Addr 0 and A400 to EC00.
• Uses 16K bytes of system memory space, normally in an Upper Memory Block.

Special Features:

• 4K-byte dual port RAM shared by host and P-51.
• Dual Data Pointer.
• Square Root function.
• Debug capability.
• Breakpoint and single-step.
• Software interrupt generation.
• 3.3v 100-pin QFP.
• 5v I/O tolerant.
• 51 MHz operation

P-51 Pinout diagram:

P-51 Package Dimensions:

P-51 PCB Pattern: