N87C51 Datasheet (Intel Corporation) - CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

N87C51, CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

VCC: Supply voltage during normal, Idle and Power Down operations.

VSS: Circuit ground.

Port 0: Port 0 is an 8-bit open drain bidirectional I/O port.

As an output port each pin can sink several LS TTL inputs.

Port 0 pins that have 1's written to them float, and in that state can be used as high-impe

87C51/80C51BH/80C31BH CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER Commercial/Express 87C51/80C51BH/80C51BHP/80C31BH See Table 1 for Proliferation Options High Performance CHMOS EPROM 24 MHz Operation Improved Quick-Pulse Programming Algorithm 3-Level Program Memory Lock Boolean Processor 128-Byte Data RAM 32 Programmable I/O Lines Two 16-Bit Timer/Counters Extended Temperature Range (- 40°C to + 85 ° C) 5 Interrupt Sources Programmable Serial Port TTL- and

N87C51 Features

* of the MCS-51 Family, as listed below: Pin P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7 Name RXD TXD INT0 INT1 T0 T1 WR RD Alternate Function Serial input line Serial output line External Interrupt 0 External Interrupt 1 Timer 0 external input Timer 1 external input External Data Memory Write strobe Exte