MSP430F14X1 datasheet(40/88 Pages) TI2

40 / 88 page

MSP430F149, MSP430F148, MSP430F147

MSP430F1491, MSP430F1481, MSP430F1471

MSP430F135, MSP430F133

SLAS272H – JULY 2000 – REVISED MAY 2018

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Detailed Description

6.8

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 MSP430x1xx Family User’s Guide.

6.8.1

Digital I/O

Six 8-bit I/O ports are implemented: ports P1 to P6:

•

All individual I/O bits are independently programmable.

•

Any combination of input, output, and interrupt conditions is possible.

•

Edge-selectable interrupt input capability for all the eight bits of ports P1 and P2.

•

Read and write access to port-control registers is supported by all instructions.

6.8.2

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 6 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 subsystem clock used by the peripheral modules

6.8.3

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 configured as an interval timer and can generate interrupts at

selected time intervals.

6.8.4

Hardware Multiplier (MSP430F14x and MSP430F14x1 Only)

The multiplication operation is supported by a dedicated peripheral module. The module performs 16 × 16,

16 × 8, 8 × 16, and 8 × 8 bit operations. The module is capable of supporting signed and unsigned

multiplication as well as signed and unsigned multiply and accumulate operations. The result of an

operation can be accessed immediately after the operands have been loaded into the peripheral registers.

No additional clock cycles are required.

6.8.5

USART0

The hardware universal synchronous/asynchronous receive transmit (USART0) peripheral module is used

for serial data communication. The USART supports synchronous SPI (3 or 4 pin) and asynchronous

UART communication protocols, using double-buffered transmit and receive channels.

6.8.6

USART1 (MSP430F14x and MSP430F14x1 Only)

The MSP430F14x(1) has a second hardware universal synchronous/asynchronous receive transmit

(USART1) peripheral module that is used for serial data communication. The USART supports

synchronous SPI (3 or 4 pin) and asynchronous UART communication protocols, using double-buffered

transmit and receive channels. Operation of USART1 is identical to USART0.

6.8.7

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.

MSP430F14X1 Datasheet(PDF) 40 Page - Texas Instruments

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