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GENERAL DESCRIPTION

The P80C557E6/P83C557E6 (hereafter generically referred to as P8xC557E6) single-chip 8-bit microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family. The P8xC557E6 has the same instruction set as the 80C51. Three versions of the derivative exist:

? P83C557E6 — 48 Kbytes mask programmable ROM

? P80C557E6 — ROMless version of the P83C557E6

FEATURES

? 80C51 central processing unit

? 48 K × 8 ROM, expandable externally to 64 Kbytes

? ROM Code protection

? 1536 × 8 RAM, expandable externally to 64 Kbytes

? Two standard 16-bit timer/counters

? An additional 16-bit timer/counter coupled to four capture registers

and three compare registers

? A 10-bit ADC with eight multiplexed analog inputs and

programmable autoscan

? Two 8-bit resolution, pulse width modulation outputs

? Five 8-bit I/O ports plus one 8-bit input port shared with analog

inputs

? I2C-bus serial I/O port with byte oriented master and slave

functions

? Full-duplex UART compatible with the standard 80C51

? On-chip watchdog timer

? 15 interrupt sources with 2 priority levels (2 to 6 external sources

possible)

? Extended temperature range (–40 to +85 °C)

? 4.5 to 5.5 V supply voltage range

? Frequency range for 80C51–family standard oscillator: 3.5 MHz to

16 MHz

? PLL oscillator with 32 kHz reference and software–selectable

system clock frequency

? Seconds Timer

? Software enable/disable of ALE output pulse

? Electromagnetic compatibility improvements

? Wake–up from Power–down by external or seconds interrupt