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STR712FR1XX Datasheet(PDF) 7 Page - STMicroelectronics |
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STR712FR1XX Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 77 page  STR71xF System architecture 7/77 Flexible Power Management To minimize power consumption, you can program the STR710 to switch to SLOW, WAIT, LPWAIT (low power wait), STOP or STANDBY mode depending on the current system activity in the application. Flexible Clock Control Two external clock sources can be used, a main clock and a 32 kHz backup clock. The embedded PLL allows the internal system clock (up to 66 MHz) to be generated from a main clock frequency of 16 MHz or less. The PLL output frequency can be programmed using a wide selection of multipliers and dividers. The microcontroller core, APB1 and APB2 peripherals are in separate clock domains and can be programmed to run at different frequencies during application runtime. The clock to each peripheral is gated with an individual control bit to optimize power usage by turning off peripherals any time they are not required. Voltage Regulators The STR710 requires an external 3.0-3.6V power supply. There are two internal Voltage Regulators for generating the 1.8V power supply for the core and peripherals. The main VR is switched off during low power operation. Low Voltage Detectors Both the Main Voltage Regulator and the Low Power Voltage Regulator contain each a low voltage detection circuitry which keep the device under reset when the corresponding controlled voltage value (V18 or V18BKP) falls below 1.35V (+/- 10%). This enhances the security of the system by preventing the MCU from going into an unpredictable state. An external reset circuit must be used to provide the RESET at V33 power-up. It is not sufficient to rely on the RESET generated by the LVD in this case. This is because LVD operation is guaranteed only when V33 is within the specification. 4.1 On-chip peripherals CAN Interface (STR710 and STR712) The CAN module is compliant with the CAN specification V2.0 part B (active). The bit rate can be programmed up to 1 MBaud. USB Interface (STR710 and STR711) The full-speed USB interface is USB V2.0 compliant and provides up to 16 bidirectional/32 unidirectional endpoints, up to 12 Mb/s (full-speed), support for bulk transfer, isochronous transfers and USB Suspend/Resume functions. Standard Timers Each of the four timers have a 16-bit free-running counter with 7-bit prescaler Three timers each provide up to two input capture/output compare functions, a pulse counter function, and a PWM channel with selectable frequency. The fourth timer is not connected to the I/O ports. It can be used by the application software for general timing functions. |
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