MSP430F543X_10 Datasheet, PDF (17/99 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F543x, MSP430F541x
www.ti.com
SLAS612C – AUGUST 2009 – REVISED MARCH 2010
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 MSP430x5xx Family User's Guide, literature number
SLAU208.
Digital I/O
There are up to ten 8-bit I/O ports implemented: For 100-pin options, P1 through P10 are complete. P11 contains
three individual I/O ports. For 80-pin options, P1 through P7 are complete. P8 contains seven individual I/O ports.
P9 through P11 do not exist. Port PJ contains four individual I/O ports, common to all devices.
• All individual I/O bits are independently programmable.
• Any combination of input, output, and interrupt conditions is possible.
• Pullup or pulldown on all ports is programmable.
• Drive strength on all ports is programmable.
• Edge-selectable interrupt and LPM5 wakeup input capability is available for all bits of ports P1 and P2.
• Read/write access to port-control registers is supported by all instructions.
• Ports can be accessed byte-wise (P1 through P11) or word-wise in pairs (PA through PF).
Oscillator and System Clock
The clock system in the MSP430x5xx family of devices is supported by the Unified Clock System (UCS) module
that includes support for a 32-kHz watch crystal oscillator (XT1 LF mode), an internal very-low-power
low-frequency oscillator (VLO), an internal trimmed low-frequency oscillator (REFO), an integrated internal
digitally controlled oscillator (DCO), and a high-frequency crystal oscillator (XT1 HF mode or XT2). The UCS
module is designed to meet the requirements of both low system cost and low power consumption. The UCS
module features digital frequency locked loop (FLL) hardware that, in conjunction with a digital modulator,
stabilizes the DCO frequency to a programmable multiple of the selected FLL reference frequency. The internal
DCO provides a fast turn-on clock source and stabilizes in less than 5 µs. The UCS module provides the
following clock signals:
• Auxiliary clock (ACLK), sourced from a 32-kHz watch crystal, a high-frequency crystal, the internal
low-frequency oscillator (VLO), the trimmed low-frequency oscillator (REFO), or the internal digitally controlled
oscillator DCO.
• Main clock (MCLK), the system clock used by the CPU. MCLK can be sourced by same sources made
available to ACLK.
• Sub-Main clock (SMCLK), the subsystem clock used by the peripheral modules. SMCLK can be sourced by
same sources made available to ACLK.
• ACLK/n, the buffered output of ACLK, ACLK/2, ACLK/4, ACLK/8, ACLK/16, ACLK/32.
Power Management Module (PMM)
The PMM includes an integrated voltage regulator that supplies the core voltage to the device and contains
programmable output levels to provide for power optimization. The PMM also includes supply voltage supervisor
(SVS) and supply voltage monitoring (SVM) circuitry, as well as brownout protection. The brownout circuit is
implemented to provide the proper internal reset signal to the device during power-on and power-off. The
SVS/SVM circuitry detects if the supply voltage drops below a user-selectable level and supports both supply
voltage supervision (the device is automatically reset) and supply voltage monitoring (SVM, the device is not
automatically reset). SVS and SVM circuitry is available on the primary supply and core supply.
Hardware Multiplier
The multiplication operation is supported by a dedicated peripheral module. The module performs operations with
32-bit, 24-bit, 16-bit, and 8-bit operands. The module is capable of supporting signed and unsigned multiplication
as well as signed and unsigned multiply and accumulate operations.
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