GENERAL DESCRIPTION
INTRODUCTION
The ST72334J/N, ST72314J/N and ST72124J devices are members of the ST7 microcontroller family. They can be grouped as follows:
– ST72334J/Ndevices are designed for mid-range applications with Data EEPROM, ADC, SPI and SCI interface capabilities.
– ST72314J/N devices target the same range of applications but without Data EEPROM.
– ST72124J devices are for applications that do not need Data EEPROM and the ADC peripheral.

All devices are based on a common industry standard 8-bit core, featuring an enhanced instruction set.
The ST72C334J/N, ST72C314J/N and ST72C124J versions feature single-voltage FLASH memory with byte-by-byte In-Situ Programming (ISP) capability.

■ 8K or 16K Program memory (ROM or Single voltage FLASH) with read-out protection
■ 256-bytes EEPROM Data memory
■ In-Situ Programming (Remote ISP)
■ Enhanced Reset System
■ Low voltage supply supervisor with 3 programmable levels
■ Low consumption resonator or RC oscillators and by-pass for external clock source, with safe control capabilities
■ 4 Power saving modes
■ Standard Interrupt Controller
■ 44 or 32 multifunctional bidirectional I/O lines:
   – External interrupt capability (4 vectors)
   – 21 or 19 alternate function lines
   – 12 or 8 high sink outputs
■ Real time base, Beep and Clock-out capabilities
■ Configurable watchdog reset
■ Two 16-bit timers with:
   – 2 input captures (only one on timer A)
   – 2 output compares (only one on timer A)
   – External clock input on timer A
   – PWM and Pulse generator modes
■ SPI synchronous serial interface
■ SCI asynchronous serial interface
■ 8-bit ADC with 8 input pins
   (6 only on ST72334Jx, not available on ST72124J2)
■ 8-bit data manipulation
■ 63 basic instructions
■ 17 main addressing modes
■ 8 x 8 unsigned multiply instruction
■ True bit manipulation
■ Full hardware/software development package