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 I²C interface capabilities.
    – ST72215/6G devices target the same range of
        applications but without I²C interface.
    – ST72104G devices are for applications that do
        not need ADC and I²C peripherals.
All devices are based on a common industry standard 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