The ST72F321B Flash and ST72321B ROM devices are members of the ST7 microcontroller family designed for mid-range applications.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. 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, 2 general purpose timers, I²C bus, SPI interface and an SCI interface.For power economy, microcontroller can switch dynamically into WAIT, SLOW, ACTIVE-HALT or HALT mode when the application is in idle or stand-by state.Typical applications are consumer, home, office and industrial products.
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: 40 years at 85°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 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 14 interrupt vectors plus TRAP and RESET Top Level Interrupt (TLI) pin on 64-pin devices 15/9 external interrupt lines (on 4 vectors)
Up to 48 I/O Ports 48/32/24 multifunctional bidirectional I/O lines 34/22/17 alternate function lines 16/12/10 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
3 Communications Interfaces SPI synchronous serial interface SCI asynchronous serial interface I²C multimaster interface
1 Analog peripheral (low current coupling) 10-bit ADC with up to 16 robust 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
