The ST72F521 and ST72521B 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 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, 8x8 unsigned multiplication and indirect addressing modes.
Analog periperal (low current coupling)10-bit ADC with 16 input robust input ports
4 Communications InterfacesSPI synchronous serial interfaceSCI asynchronous serial interface I2C multimaster interface (SMbus V1.1 compliant)CAN interface (2.0B Passive)
Development ToolsFull hardware/software development packageIn-Circuit Testing capability
Memories32K to 60K dual voltage High Density Flash (HDFlash) or ROM with read-out protection capability. In-Application Programming and In-Circuit Programming for HDFlash devices1K to 2K RAMHDFlash endurance: 100 cycles, data retention: 20 years at 55˚C
Interrupt ManagementNested interrupt controller14 interrupt vectors plus TRAP and RESETTop Level Interrupt (TLI) pin15 external interrupt lines (on 4 vectors)
Clock, Reset And Supply ManagementEnhanced low voltage supervisor (LVD) for main supply and auxiliary voltage detector (AVD) with interrupt capabilityClock sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clockPLL for 2x frequency multiplicationFour power saving modes: Halt, Active-Halt, Wait and Slow
5 TimersMain Clock Controller with: Real time base, Beep and Clock-out capabilitiesConfigurable watchdog timerTwo 16-bit timers with: 2 input captures, 2 output compares, external clock input on one timer, PWM and pulse generator modes8-bit PWM Auto-Reload timer with: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
Instruction Set8-bit Data Manipulation63 Basic Instructions17 main Addressing Modes8 x 8 Unsigned Multiply Instruction
Up to 64 I/O Ports48 multifunctional bidirectional I/O lines34 alternate function lines16 high sink outputs
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