INTRODUCTION
The ST72521(A)R and ST72521M devices are members of the ST7 microcontroller family designed for mid-range applications with a CAN bus interface (Controller Area Network).
All devices are based on a common industrystandard 8-bit core, featuring an enhanced instruction set and are available with FLASH or ROM program memory.

■ Memories
    – 32K to 60K dual voltage High Density Flash (HDFlash) or ROM with read-out protection capability. In-Application Programming and In-Circuit Programming for HDFlash devices
    – 1K to 2K RAM
    – HDFlash endurance: 100 cycles, data retention: 20 years at 55°C
■ Clock, Reset And Supply Management
    – Enhanced low voltage supervisor (LVD) for main supply and auxiliary voltage detector (AVD) with interrupt capability
    – Clock sources: crystal/ceramic resonator oscillators, internal or external RC oscillator, clock security system 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
    – 14 interrupt vectors plus TRAP and RESET
    – Top Level Interrupt (TLI) pin
    – 15 external interrupt lines (on 4 vectors)
■ Up to 64 I/O Ports
    – 48 multifunctional bidirectional I/O lines
    – 34 alternate function lines
    – 16 high sink outputs
■ 5 Timers
    – Main Clock Controller with: Real time base, Beep and Clock-out capabilities
    – 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
    – 8-bit PWM Auto-Reload timer with: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
■ 4 Communications Interfaces
    – SPI synchronous serial interface
    – SCI asynchronous serial interface (LIN compatible)
    – I2C multimaster interface
    – CAN interface (2.0B Passive)
■ Analog peripheral
    – 10-bit ADC with 16 input pins
■ 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