INTRODUCTION
The ST72F324L and ST72324BL devices are members of the ST7 microcontroller family designed for the 3V operating range. They can be grouped as follows:
   – The 32-pin devices are designed for mid-range applications
   – The 44-pin devices target the same range of applications requiring more than 24 I/O ports.
All devices are based on a common industry standard 8-bit core, featuring an enhanced instruction set and are available with FLASH or ROM program memory.

■ Memories
   – 8 to 32K dual voltage High Density Flash (HD Flash) or ROM with read-out protection capability. In-Application Programming and In Circuit Programming for HDFlash devices
   – 384 to 1K bytes RAM
   – HDFlash endurance: 100 cycles, data retention: 20 years at 55°C
■ Clock, Reset And Supply Management
   – Clock sources: crystal/ceramic resonator os cillators, internal RC oscillator, and bypass for external clock
   – PLL for 2x frequency multiplication
   – Four Power Saving Modes: Halt, Active-Halt, Wait and Slow
■ Interrupt Management
   – Nested interrupt controller
   – 10 interrupt vectors plus TRAP and RESET
   – 9/6 external interrupt lines (on 4 vectors)
■ Up to 32 I/O Ports
   – 32/24 multifunctional bidirectional I/O lines
   – 22/17 alternate function lines
   – 12/10 high sink outputs
■ 4 Timers
   – Main Clock Controller with: Real time base, Beep and Clock-out capabilities
   – Configurable watchdog timer
   – 16-bit Timer A with: 1 input capture, 1 output compare, external clock input, PWM and pulse generator modes
   – 16-bit Timer B with: 2 input captures, 2 output compares, PWM and pulse generator modes
■ 2 Communication Interfaces
   – SPI synchronous serial interface
   – SCI asynchronous serial interface
■ 1 Analog Peripheral
   – 10-bit ADC with up to 12 input ports
■ Instruction Set
   – 8-bit Data Manipulation
   – 63 Basic Instructions
   – 17 main Addressing Modes
   – 8 x 8 Unsigned Multiply Instruction
■ Development Tools
   – Full hardware/software development package
   – In-Circuit Testing capability