DESCRIPTION

The P80C652/83C652 Single-Chip 8-Bit

Microcontroller is manufactured in an

advanced CMOS process and is a derivative

of the 80C51 microcontroller family. The

80C652/83C652 has the same instruction set

as the 80C51. Three versions of the

derivative exist:

83C652 — 8k bytes mask programmable

ROM

80C652 — ROMless version

87C652 — EPROM version (described in a

separate chapter)

This device provides architectural

enhancements that make it applicable in a

variety of applications for general control

systems. The 8XC652 contains a non-volatile

8k × 8 read-only program memory, 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 I2C interface, UART

and on-chip oscillator and timing circuits. For

systems that require extra capability, the

8XC652 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(24)MHz crystal, 58 of

the instructions are executed in 0.75(0.5)ms

and 40 in 1.5(1)ms. Multiply and divide

instructions require 3(2)ms.

FEATURES

• 80C51 central processing unit

• 8k × 8 ROM 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

• I2C-bus serial I/O port with byte oriented

master and slave functions

• Full-duplex UART facilities

• Power control modes

– Idle mode

– Power-down mode

• ROM code protection

• Extended frequency range: 3.5 to 24 MHz

• Three operating ambient temperature

ranges:

0 to +70°C

–40 to +85°C

–40 to +125°C