INTRODUCTION
The ST72104G, ST72215G, ST72216G and ST72254G devices are members of the ST7 microcontroller family. They can be grouped as follows:
– ST72254G devices are designed for mid-range applications with ADC and I C interface capabilities.
– ST72215/6G devices target the same range of applications but without I C interface.
– ST72104G devices are for applications that do not need ADC and I C peripherals.

All devices are based on a common industrystandard 8-bit core, featuring an enhanced instruction set.

■ Memories
   – 4K or 8K bytes Program memory (ROM and single voltage FLASH) with read-out protection and in-situ programming (remote ISP)
   – 256 bytes RAM
■ Clock, Reset and Supply Management
   – Enhanced reset system
   – Enhanced low voltage supply supervisor with 3 programmable levels
   – Clock sources: crystal/ceramic resonator oscillators or RC oscillators, external clock, backup Clock Security System
   – Clock-out capability
   – 3 Power Saving Modes: Halt, Wait and Slow
■ Interrupt Management
   – 7 interrupt vectors plus TRAP and RESET
   – 22 external interrupt lines (on 2 vectors)
■ 22 I/O Ports
   – 22 multifunctional bidirectional I/O lines
   – 14 alternate function lines
   – 8 high sink outputs
■ 3 Timers
   – Configurable watchdog timer
   – Two 16-bit timers with: 2 input captures, 2 output compares, external clock input on one timer, PWM and Pulse generator modes (one only on ST72104Gx and ST72216G1)
■ 2 Communications Interfaces
   – SPI synchronous serial interface
   – I2C multimaster interface (only on ST72254Gx)
■ 1 Analog peripheral
   – 8-bit ADC with 6 input channels (except on ST72104Gx)
■ Instruction Set
   – 8-bit data manipulation
   – 63 basic instructions
   – 17 main addressing modes
   – 8 x 8 unsigned multiply instruction
   – True bit manipulation
■ Development Tools
   – Full hardware/software development package