The ST72F321 and ST72321 devices are members of the ST7 microcontroller family designed for mid-range applications. 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. Under software control, all devices can be placed in WAIT, SLOW, ACTIVE-HALT or HALT mode, reducing power consumption when the application is in idle or stand-by state. The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers feature true bit manipulation, 8×8 unsigned multiplication and indirect addressing modes.
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 oC
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, 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 on 64-pin devices 15 external interrupt lines (on 4 vectors)
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 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 10-bit ADC with up to 16 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
