Description
The T8xC5101/02 family is a high performance CMOS ROM, OTP, EPROM derivative of the 80C51 CMOS single chip 8-bit microcontroller.
The T8xC5101/02 family is a low pin count device where only Port 1, port 3 and 2/6 bits of a new port 4 are outputted. This prevents any external access, like external program memory access (fetch, MOVC) or external data memory (MOVX). The T8xC5101/02 family retains all features of the 80C51 with extended capacity 8 KB ROM (5102), 16 KB ROM (5101)/16 KB EPROM/OTP (5101), 256 bytes of internal RAM, a 6-source, 4-level interrupt system, an on-chip oscillator and three timer/counters.

Features
• 80C51 Code Compatible
   – 8051 Instruction Compatible
   – 16 I/O + 2 Outputs in 24 Pin Packages
      16 I/O + 6 Outputs in 28 Pin Packages
   – Three 16-bit Timer/Counters
   – 256 Bytes Scratchpad RAM
• Program Memory
   – 8 KB ROM T83C5102
   – 16 KB ROM T83C5101
   – 16 KB EPROM/OTP T87C5101
• High-speed Architecture
• 40 MHz from 2.7 to 5.5V, Commercial or Industrial Temperature Range:
   – 40 MHz with a 40 MHz Crystal In Std. Mode
   – 40 MHz with a 20 MHz Crystal In X2 Mode
• 66 MHz from 4.5 to 5.5V, Commercial Temperature Range
   – 40 MHz with a 40 MHz Crystal in Std. Mode
   – 66 MHz with a 33 MHz Crystal in X2 Mode
• Dual Data Pointer
• On-chip eXpanded RAM (XRAM) (256 bytes)
• Programmable Clock Out and Up/Down Timer/Counter 2
• Asynchronous Port Reset
• Interrupt Structure with
   – 6 Interrupt Sources,
   – 4-Level Priority Interrupt System
• Full-duplex Enhanced UART
   – Framing Error Detection
   – Automatic Address Recognition
• Low EMI (no ALE)
• Power Control Modes
   – Idle Mode
   – Power-down Mode
• Packages: SO24, DIL24, SSOP24, SO28