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ST92141 датащи(PDF) 6 Page - STMicroelectronics |
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ST92141 датащи(HTML) 6 Page - STMicroelectronics |
6 / 179 page 6/179 ST92141 - GENERAL DESCRIPTION 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The ST92141 microcontroller is developed and manufactured by STMicroelectronics using a pro- prietary n-well HCMOS process. Its performance derives from the use of a flexible 256-register pro- gramming model for ultra-fast context switching and real-time event response. The intelligent on- chip peripherals offload the ST9 core from I/O and data management processing tasks allowing criti- cal application tasks to get the maximum use of core resources. The new-generation ST9 MCU devices now also support low power consumption and low voltage operation for power-efficient and low-cost embedded systems. 1.1.1 ST9+ Core The advanced Core consists of the Central Processing Unit (CPU), the Register File, the Inter- rupt controller, and the Memory Management Unit. The MMU allows addressing of up to 4 Megabytes of program and data mapped into a single linear space. Four independent buses are controlled by the Core: a 16-bit memory bus, an 8-bit register data bus, an 8-bit register address bus and a 6-bit inter- rupt bus which connects the interrupt controllers in the on-chip peripherals with the core. Note: The DMA features of the ST9+ core are not used by the on-chip peripherals of the ST92141. This multiple bus architecture makes the ST9 fam- ily devices highly efficient for accessing on and off- chip memory and fast exchange of data with the on-chip peripherals. The general-purpose registers can be used as ac- cumulators, index registers, or address pointers. Adjacent register pairs make up 16-bit registers for addressing or 16-bit processing. Although the ST9 has an 8-bit ALU, the chip handles 16-bit opera- tions, including arithmetic, loads/stores, and mem- ory/register and memory/memory exchanges. 1.1.2 Power Saving Modes To optimize performance versus power consump- tion, a range of operating modes can be dynami- cally selected by software according to the re- quirements of the application. Run Mode. This is the full speed execution mode with CPU and peripherals running at the maximum clock speed delivered either by the Phase Locked Loop controlled by the RCCU (Reset and Clock Control Unit), directly by the oscillator or by an ex- ternal source (dedicated Pin or Alternate Func- tion). Slow Mode. Power consumption can be signifi- cantly reduced by running the CPU and the periph- erals at reduced clock speed using the CPU Pres- caler and RCCU Clock Divider. Wait For Interrupt Mode. The Wait For Interrupt (WFI) instruction suspends program execution un- til an interrupt request is acknowledged. During WFI, the CPU clock is halted while the peripheral with interrupt capability and interrupt controller are kept running at a frequency that can be pro- grammed by software in the RCCU registers. In this mode, the power consumption of the device can be reduced by more than 95% (Low Power WFI). Halt Mode. When executing the HALT instruction, and if the Watchdog is not enabled, the CPU and its peripherals stop operating. If however the Watchdog is enabled, the HALT instruction has no effect. The main difference between Halt mode and Stop mode is that a reset is necessary to exit from Halt mode which causes the system to be reinitialized. Stop Mode. When Stop mode is requested by ex- ecuting the STOP sequence (see Wake-up Man- agement Unit section), the CPU and the peripher- als stop operating. Operations resume after a wake-up line is activated. The difference between Stop mode and Halt mode is in the way the CPU exits each state: when the STOP sequence is ex- ecuted, the status of the registers is recorded, and when the system exits from Stop mode the CPU continues execution with the same status, without a system reset. The Watchdog counter, if enabled, is stopped. Af- ter exiting Stop mode it restarts counting from where it left off. When the MCU exits from STOP mode, the oscil- lator, which was also sleeping, requires a start-up time to restart working properly. An internal coun- ter is present to guarantee that, after exiting Stop Mode, all operations take place with the clock sta- bilised. 1.1.3 System Clock A programmable PLL Clock Generator allows standard 3 to 5 MHz crystals to be used to obtain a large range of internal frequencies up to 25MHz. 9 |
Аналогичный номер детали - ST92141 |
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Аналогичное описание - ST92141 |
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