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ST72321AR6-Auto：8-bit MCU for automotive with 32 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces

The ST72321xx-Auto Flash and ROM devices are members of the ST7 microcontroller family designed for mid-range automotive applications running from 3.8 to 5.5V.

All devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set and are available with Flash program memory. The ST7 family architecture offers both power and flexibility to software developers, enabling the design of highly efficient and compact application code.

The on-chip peripherals include an A/D converter, a PWM autoreload timer, two general purpose timers, I²C, SPI, SCI interfaces.

For power economy, the microcontroller can switch dynamically into Wait, Slow, Active Halt or Halt mode when the application is in idle or standby state.

Key Features

• Memories
  • 32 to 60 Kbyte dual voltage High Density Flash (HDFlash) or ROM ROM with readout protection capability. In-application programming and in-circuit programming for HDFlash devices
  • 1 to 2 Kbyte RAM
  • HDFlash endurance: 100 cycles, data retention 20 years
• 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 RC oscillator and bypass for external clock
  • PLL for 2x frequency multiplication
  • 4 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 on 64-pin devices
  • 15 external interrupt lines (on 4 vectors)
• 1 analog peripheral
  • 10-bit ADC with up to 16 input ports
• Up to 48 I/O ports
  • 48//32 multifunctional bidirectional I/O lines
  • 34//22 alternate function lines
  • 16//12 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 1 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
• 3 communications interfaces
  • SPI synchronous serial interface
  • SCI asynchronous serial interface
  • I2 C multimaster interface
• Instruction set
  • 8-bit data manipulation
  • 63 basic instructions
  • 17 main addressing modes
  • 8x8 unsigned multiply instruction
• Development tools
  • Full hardware/software development package, ICT capability

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