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MSP430F2101IDWR Datasheet(PDF) 11 Page - Texas Instruments |
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MSP430F2101IDWR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 62 page MSP430F21x1 www.ti.com SLAS439F – SEPTEMBER 2004 – REVISED AUGUST 2011 Peripherals Peripherals are connected to the CPU through data, address, and control buses and can be handled using all instructions. For complete module descriptions, see the MSP430x2xx Family User's Guide (SLAU144). 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: • Auxiliary clock (ACLK), sourced from a 32768-Hz watch crystal or a high-frequency crystal • Main clock (MCLK), the system clock used by the CPU • Sub-Main clock (SMCLK), the sub-system clock used by the peripheral modules Table 13. DCO Calibration Data, Provided From Factory In Flash Info Memory Segment A DCO FREQUENCY CALIBRATION REGISTER SIZE ADDRESS CALBC1_1MHZ byte 0x010FF 1 MHz CALBC0_1MHZ byte 0x010FE CALBC1_8MHZ byte 0x010FD 8 MHz CALBC0_8MHZ byte 0x010FC CALBC1_12MHZ byte 0x010FB 12 MHz CALBC0_12MHZ byte 0x010FA CALBC1_16MHZ byte 0x010F9 16 MHz CALBC0_16MHZ byte 0x010F8 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. • All individual I/O bits are independently programmable. • Any combination of input, output, and interrupt condition is possible. • Edge-selectable interrupt input capability for all eight bits of port P1 and P2. • Read/write access to port-control registers is supported by all instructions. • Each I/O has an individually programmable pullup/pulldown resistor. Watchdog Timer (WDT+) The primary function of the 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 disabled or configured as an interval timer and can generate interrupts at selected time intervals. Comparator_A+ The primary function of the comparator_A+ module is to support precision slope analog-to-digital conversions, battery-voltage supervision, and monitoring of external analog signals. Copyright © 2004–2011, Texas Instruments Incorporated 11 |
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