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. This device provides architectural enhancements that make it applicable in a variety of applications for general control systems. The 87C654 contains a non-volatile × 8 EPROM and the 87C652 contains x 8 EPROM. Both have a volatile × 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 I2C 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. The device also functions as an arithmetic processor having facilities for both binary and BCD arithmetic plus bit-handling capabilities. The instruction set consists 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 0.75 µs and in 1.5 µs. Multiply and divide instructions require 3 µs.

· Two standard 16-bit timer/counters· Four 8-bit I/O ports· I2C-bus serial I/O port with byte oriented

to +70, Plastic Dual In-line Package to +70, Plastic Leaded Chip Carrier to +70, Plastic Quad Flat Pack to +85, Plastic Dual In-line Package to +85, Plastic Leaded Chip Carrier to +85, Plastic Quad Flat Pack to +70, Plastic Dual In-line Package to +70, Plastic Leaded Chip Carrier to +70, Plastic Dual In-line Package to +70, Plastic Leaded Chip Carrier to +70, Plastic Quad Flat Pack to +85, Plastic Leaded Chip Carrier NOTES: 1. For ROM see 83C654 data sheet and 83C652/80C652 data sheet

INTERNAL INTERRUPTS 64K BYTE BUS EXPANSION CONTRTOL PROG SERIAL PORT FULL DUPLEX UART SYNCHRONOUS SHIFT

VCC VSS ADDRESS AND DATA BUS SCL SDA RxD TxD WR RD ADDRESS BUS RST PORT 0 PORT 2 PORT XTAL1 XTAL2 VPP/EA PSEN PROG/ALE