Texas Instruments MSP430 Student Guide

Timer Details: Configuring TIMER_A
PWM anyone?
PWM, or pulse-width modulation, is commonly used to control the amount of energy going into a
system. For example, by making the pulse widths longer, more energy is supplied to the system.
Looking again at the previous example where OUTMOD = 2, we can see that by changing the
difference between the values of CCR0 and CCRn we can set the width of OUTn.
PWM Signals – Up to one per CCR
0xFFFF
TA0CCR0
TA0CCR1
TA0CCR2
0x0
OUT1
 Duty cycle (“on” time ) is set by selecting Output Mode and varying CCRx value
 In this example, CCR0 – CCR1 = amount of time Signal is High
CCR0 sets the time period
CCRn sets duty cycle
In the case of the MSP430, any timer can generate a PWM waveform by configuring the CCR
registers appropriately. In fact, if you are using a Timer_A5, you could output 4 or 5 different
PWM waveforms.
MSP430 Workshop - Timers 6 - 29

Texas Instruments MSP430 Specifications

General

Program Memory Type	Flash
Clock Speed	Up to 25 MHz (depending on the specific device)
Flash Memory	Up to 512 KB (depending on the specific device)
RAM	Up to 66 KB (depending on the specific device)
Operating Voltage	1.8V - 3.6V (depending on the specific device)
ADC	10-bit or 12-bit SAR ADC
Communication Interfaces	UART, SPI, I2C, USB
DMA	Yes (depending on the specific device)
Operating Temperature	-40°C to +85°C
Architecture	16-bit RISC
Low Power Modes	Multiple (LPM0 to LPM4)