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Texas Instruments MSP430x11x1 warranty peripherals, oscillator and system clock

Models: MSP430x11x1

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peripherals

MSP430x11x1

MIXED SIGNAL MICROCONTROLLER

SLAS241C ± SEPTEMBER 1999 ± REVISED JUNE 2000

peripherals

Peripherals are connected to the CPU through data, address, and control buses and can be handled easily with memory manipulation instructions.

oscillator and system clock

Three clocks are used in the systemÐthe system (master) clock MCLK, the subsystem (master) clock SMCLK, and the auxiliary clock ACLK:

Main system clock MCLK, used by the CPU and the system Subsystem clock SMCLK, used by the peripheral modules

Auxiliary clock ACLK, originated by LFXT1CLK (crystal frequency) and used by the peripheral modules

After a POR, the DCOCLK is used by default, the DCOR bit is reset, and the DCO is set to the nominal initial frequency. Additionally, if LFXT1CLK fails as the source for MCLK, the DCOCLK is automatically selected to ensure fail-safe operation.

SMCLK can be generated from LFXT1CLK or DCOCLK. ACLK is always generated from LFXT1CLK.

The crystal oscillator can be defined to operate with watch crystals (32768 Hz) or with higher-frequency ceramic resonators or crystals. The crystal or ceramic resonator is connected across two terminals. No external components are required for watch-crystal operation. If the high frequency XT1 mode is selected, external capacitors from XIN to VSS and XOUT to VSS are required as specified by the crystal manufacturer.

The LFXT1 oscillator starts after applying VCC. If the OscOff bit is set to 1, the oscillator stops when it is not used for MCLK. The clock signals ACLK and SMCLK may be used externally via port pins.

Different application requirements and system conditions dictate different system clock requirements, including:

High frequency for quick reaction to system hardware requests or events

Low frequency to minimize current consumption, EMI, etc.

Stable peripheral clock for timer applications, such as real-time clock (RTC)

Start-stop operation to be enabled with minimum delay

18	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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Texas Instruments warranty peripherals, oscillator and system clock, MSP430x11x1 MIXED SIGNAL MICROCONTROLLER

Contents

D Five Power Saving Modes MIXED SIGNAL MICROCONTROLLERD Ultralow-Power Consumption Standby Mode 0.8 ∝AMSP430x11x1 MIXED SIGNAL MICROCONTROLLER functional block diagramprocessing unit Terminal Functionsshort-form description MIXED SIGNAL MICROCONTROLLERinstruction set Table 2. Address Mode Descriptionsshort-form description continued Table 1. Instruction Word Formatsinstruction set continued low-power consumption capabilitiesoperation modes and interrupts MSP430x11x1 MIXED SIGNAL MICROCONTROLLERstatus register R2 MSP430x11x1 MIXED SIGNAL MICROCONTROLLERINTERRUPT SOURCE interrupt vector addressesMSP430x11x1 MIXED SIGNAL MICROCONTROLLER INTERRUPT FLAGFlag set on oscillator fault interrupt enable 1 andReset on VCC power-on or reset condition at special function registersmemory organization boot ROM containing bootstrap loaderfunctions of the bootstrap loader MSP430x11x1 MIXED SIGNAL MICROCONTROLLERhardware resources used for serial input/output boot ROM containing bootstrap loader continuedfeatures of the bootstrap loader are MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMSP430x11x1 MIXED SIGNAL MICROCONTROLLER boot ROM containing bootstrap loader continuedD There were less than two positive edges at TEST while RST/NMI is low flash memory flash memory control register FCTL1MSP430x11x1 MIXED SIGNAL MICROCONTROLLER Erase flash memory, timing generator, control register FCTL2flash memory control register FCTL1 continued 0128h, bit1, Erase a segmentflash memory control register FCTL3 Figure 1. Flash Memory Timing Generator Diagramflash memory, timing generator, control register FCTL2 continued MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMSP430x11x1 flash memory control register FCTL3 continuedMIXED SIGNAL MICROCONTROLLER BUSYflash memory control register FCTL3 continued flash memory, interrupt and security key violationMSP430x11x1 MIXED SIGNAL MICROCONTROLLER LOCKFlash Module Figure 2. Block Diagram of NMI Interrupt SourcesMSP430x11x1 MIXED SIGNAL MICROCONTROLLER IFG1.4peripherals oscillator and system clockMSP430x11x1 MIXED SIGNAL MICROCONTROLLER digital I/O Figure 3. Clock Signalsoscillator and system clock continued MSP430x11x1 MIXED SIGNAL MICROCONTROLLERdigital I/O continued watchdog timerTimerA Three capture/compare registers MSP430x11x1 MIXED SIGNAL MICROCONTROLLERUART TimerA 3 capture/compare registers continuedFigure 4. TimerA, MSP430x11x1 Configuration MSP430x11x1 MIXED SIGNAL MICROCONTROLLERFigure 5. Block Diagram of ComparatorA ComparatorAMSP430x11x1 MIXED SIGNAL MICROCONTROLLER ComparatorA continued MIXED SIGNAL MICROCONTROLLERMSP430x11x1 ComparatorA continued slope a/d conversionMSP430x11x1 MIXED SIGNAL MICROCONTROLLER The ComparatorA is well suited for use in single or multiple-slope conversions. The internal-reference levels may be used to set a reference during timing measurement of charge or discharge operations. They can also be used externally to bias analog circuitryperipheral file map MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMSP430x11x1 MIXED SIGNAL MICROCONTROLLER absolute maximum ratings²recommended operating conditions Storage temperature, T stg unprogrammed deviceFigure 6. Frequency vs Supply Voltage recommended operating conditions continuedMSP430x11x1 Devices MSP430x11x1 MIXED SIGNAL MICROCONTROLLERsupply current into VCC excluding external current fsystem = 1 MHz current consumption of active mode versus supply voltage, C versioncurrent consumption of active mode versus supply voltage, F version MSP430x11x1 MIXED SIGNAL MICROCONTROLLERleakage current Schmitt-trigger inputs Port P1 to Port P2 P1.0 to P1.7, P2.0 to P2.5outputs Port 1 to P2 P1.0 to P1.7, P2.0 to P2.5 MSP430x11x1 MIXED SIGNAL MICROCONTROLLERinputs Px.x, TAx internal signals TAx, SMCLK at TimerAoptional resistors, individually programmable with ROM code see Note MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMSP430x11x1 MIXED SIGNAL MICROCONTROLLER outputs P1.x, P2.x, TAxComparatorA see Note t res ponse HLFigure 7. VRefVT vs Temperature, VCC = 3 V, C1121 Figure 8. VRefVT vs Temperature, VCC = 2.2 V, C1121MSP430x11x1 MIXED SIGNAL MICROCONTROLLER MSP430x11x1 MIXED SIGNAL MICROCONTROLLER Figure 9. Block Diagram of ComparatorA ModuleFigure 10. Overdrive Definition PUC/POR τ ≈ 2.0 ∝ sFigure 11. Power-On Reset POR vs Supply Voltage Figure 12. VPOR vs Temperature crystal oscillator,LFXT1MSP430x11x1 MIXED SIGNAL MICROCONTROLLER fDCOx7 Figure 13. DCO CharacteristicsMSP430x11x1 MIXED SIGNAL MICROCONTROLLER fDCOx0JTAG/programming principle characteristics of the DCOwake-up from lower power modes LPMx MSP430x11x1 MIXED SIGNAL MICROCONTROLLERAPPLICATION INFORMATION input/output schematic Port P1, P1.0 to P1.3, input/output with Schmitt-triggerMSP430x11x1 MIXED SIGNAL MICROCONTROLLER APPLICATION INFORMATION MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMIXED SIGNAL MICROCONTROLLER MSP430x11x1Port P2, P2.0 to P2.2, input/output with Schmitt-trigger APPLICATION INFORMATIONAPPLICATION INFORMATION Port P2, P2.3 to P2.4, input/output with Schmitt-triggerMSP430x11x1 MIXED SIGNAL MICROCONTROLLER APPLICATION INFORMATIONMSP430x11x1 MIXED SIGNAL MICROCONTROLLER JTAG fuse check mode Port P2, unbonded bits P2.6 and P2.7MSP430x11x1 MIXED SIGNAL MICROCONTROLLER APPLICATION INFORMATIONPLASTIC SMALL-OUTLINE PACKAGE MECHANICAL DATADW R-PDSO-G MSP430x11x1 MIXED SIGNAL MICROCONTROLLERMSP430x11x1 MIXED SIGNAL MICROCONTROLLER PW R-PDSO-GPLASTIC SMALL-OUTLINE PACKAGE MECHANICAL DATAIMPORTANT NOTICE