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