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MSP430F2111TRGET Datasheet(PDF) 9 Page - Texas Instruments |
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MSP430F2111TRGET Datasheet(HTML) 9 Page - Texas Instruments |
9 / 52 page MSP430x21x1 MIXED SIGNAL MICROCONTROLLER SLAS439C − SEPTEMBER 2004 − REVISED JULY 2006 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 peripherals Peripherals are connected to the CPU through data, address, and control busses and can be handled using all instructions. For complete module descriptions, refer to the MSP430x2xx Family User’s Guide. oscillator and system clock The clock system is supported by the basic clock module that includes support for a 32768-Hz watch crystal oscillator, an internal digitally-controlled oscillator (DCO) and a high frequency crystal oscillator. The basic clock module is designed to meet the requirements of both low system cost and low-power consumption. The internal DCO provides a fast turn-on clock source and stabilizes in less than 1 µs. The basic clock module provides the following clock signals: D Auxiliary clock (ACLK), sourced from a 32768-Hz watch crystal or a high frequency crystal. D Main clock (MCLK), the system clock used by the CPU. D Sub-Main clock (SMCLK), the sub-system clock used by the peripheral modules. DCO Calibration Data (provided from factory in flash info memory segment A) DCO Frequency Calibration Register Size Address 1 MHz CALBC1_1MHZ byte 010FFh 1 MHz CALDCO_1MHZ byte 010FEh 8 MHz CALBC1_8MHZ byte 010FDh 8 MHz CALDCO_8MHZ byte 010FCh 12 MHz CALBC1_12MHZ byte 010FBh 12 MHz CALDCO_12MHZ byte 010FAh 16 MHz CALBC1_16MHZ byte 010F9h 16 MHz CALDCO_16MHZ byte 010F8h brownout The brownout circuit is implemented to provide the proper internal reset signal to the device during power on and power off. digital I/O There are two 8-bit I/O ports implemented—ports P1 and P2: D All individual I/O bits are independently programmable. D Any combination of input, output, and interrupt conditions is possible. D Edge-selectable interrupt input capability for all the eight bits of port P1 and P2. D Read/write access to port-control registers is supported by all instructions. D Each I/O has an individually programmable pull−up/pull−down resistor. WDT+ watchdog timer The primary function of the watchdog timer (WDT+) module is to perform a controlled system restart after a software problem occurs. If the selected time interval expires, a system reset is generated. If the watchdog function is not needed in an application, the module can be configured as an interval timer and can generate interrupts at selected time intervals. |
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