87C652

Features:

*80C51 central processing unit
*16k * 8 EPROM or 8k x 8 EPROM expandable externally to 64k bytes
*256 * 8 RAM, expandable externally to 64k bytes
*Two standard 16-bit timer/counters
*Four 8-bit I/O ports
*I² C-bus serial I/O port with byte oriented master and slave functions
*Full-duplex UART facilities
*Power control modes
  Idle mode
  Power-down mode
*Extended temperature range
*OTP package available
*Two speed ranges
  16 MHz
  20 MHz


Pinout




Specifications

PARAMETER	RATING	UNIT
Operating temperature under bias	65 to +150
Storage temperature range	0.5 to + 13	V
Voltage on any other pin to VSS	0.5 to + 6.5	V
Input, output current on any two pins	±5	mA
Power dissipation(based on package heat transfer limitations, not device power consumption)	1	W

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 maxima.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V _SS unless otherwise noted.



Description

The 87C652/87C654 single-chip 8-Bit microcontroller is manufactured in an  advanced CMOS process and is a derivative of the 80C51 microcontroller family. The 87C652/87C654 has the same instruction set as the 80C51. Three versions of the derivative exist:80C652-ROMless 83C652/83C654-8 Kbyte, 16 Kbyte ROM 87C652/87C654-8 Kbyte, 16 Kbyte OTP

The ROMless and ROM are in separate datasheets.

87C652/87C654 provide architectural enhancements that make it applicable in a variety of applications for general control systems. The 87C654 contains a non-volatile 16k * 8 EPROM and the 87C652 contains an 8k x 8 EPROM. Both have a volatile 256 * 8 read/write data memory, four 8-bit I/O ports, two 16-bit timer/event counters (identical to the timers of the 80C51), a multi-source, two-priority-level, nested interrupt structure, an I² C interface, UART and on-chip oscillator and timing circuits. For systems that require extra capability, the 87C652/87C654 can be expanded using standard TTL compatible memories and logic.

87C652/87C654 also functions as an arithmetic processor having facilities for both binary and BCD arithmetic plus bit-handling capabilities. The instruction set 87C652/87C654 consist of over 100 instructions: 49 one-byte, 45 two-byte and 17 three-byte. With a 16 MHz crystal, 58% of the instructions are executed in 0.75 s and 40% in 1.5 s. Multiply and divide instructions require 3 s.