Description
The AT8xC5112 is a high performance ROM/OTP version of the 80C51 8-bit microcontroller. The AT8xC5112 retains all the features of the standard 80C51 with 8 Kbytes ROM/OTP program memory, 256 bytes of internal RAM, a 8-source, 4-level interrupt system, an on-chip oscillator and two timer/counters. The AT8xC5112 is dedicated for analog interfacing applications. For this, it has a 10-bit, 8 channels A/D converter and a five channels Programmable Counter Array. In addition, the AT8xC5112 has a Hardware Watchdog Timer, a versatile serial channel that facilitates multiprocessor communication (EUART) with an independent baud rate generator, a SPI serial bus controller and a X2 speed improvement mechanism. The X2 feature allows to keep the same CPU power at a divided by two oscillator frequency.

Features
• 80C51 Compatible
   – Five I/O Ports
   – Two 16-bit Timer/Counters
   – 256 Bytes RAM
• 8K Bytes ROM/OTP Program Memory with 64 Bytes Encryption Array and 3 Security Levels
• High-Speed Architecture
   – 33 MHz at 5V (66 MHz Equivalent)
   – X2 Speed Improvement Capability (6 Clocks/Machine Cycle)
• 10-bit, 8 Channels A/D Converter
• Hardware Watchdog Timer with Reset-out
• Programmable I/O Mode: Standard C51, Input Only, Push-pull, Open Drain
• Asynchronous Port Reset
• Full Duplex Enhanced UART with Baud Rate Generator
• SPI, Master Mode
• Dual System Clock
   – Crystal or Ceramic Oscillator (33/40 MHz)
   – Internal RC Oscillator (12 MHz)
   – Programmable Prescaler
• Programmable Counter Array with High-speed Output, Compare/Capture, Pulse Width
Modulation and Watchdog Timer Capabilities
• Interrupt Structure
   – 8 Interrupt Sources
   – 4 Interrupt Priority Levels
• Power Control Modes
   – Idle Mode
   – Power-down Mode
   – Power-off Flag
• Power Supply: 2.7 - 5.5V
• Temperature Range: Industrial (-40 To 85°C)
• Package: LQFP48 (Body 7*7*1.4 mm), PLCC52