AT90USB82/162
15. 16-bit Timer/Counter 1 with PWM
The 16-bit Timer/Counter 1 unit allows accurate program execution timing (event management),
wave generation, and signal timing measurement. The main features are:
• True 16-bit Design (i.e., Allows 16-bit PWM)
• Three independent Output Compare Units
• Double Buffered Output Compare Registers
• One Input Capture Unit
• Input Capture Noise Canceler
• Clear Timer on Compare Match (Auto Reload)
• Glitch-free, Phase Correct Pulse Width Modulator (PWM)
• Variable PWM Period
• Frequency Generator
• External Event Counter
• Five independent interrupt sources (TOV1, OCF1A, OCF1B, OCF1C, ICF1)
15.1 Overview
Most register and bit references in this section are written in general form. A lower case “n”
replaces the Timer/Counter number (for this product, only n=1 is available), and a lower case “x”
replaces the Output Compare unit channel. However, when using the register or bit defines in a
program, the precise form must be used, i.e., TCNT1 for accessing Timer/Counter1 counter
value and so on.
A simplified block diagram of the 16-bit Timer/Counter is shown in Figure 15-1. For the actual
placement of I/O pins, see “Pinout AT90USB82/162” on page 3. CPU accessible I/O Registers,
including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit loca-
tions are listed in the “16-bit Timer/Counter 1 with PWM” on page 107.
The Power Reduction Timer/Counter1 bit, PRTIM1, in “Power Reduction Register 0 - PRR0” on
page 43 must be written to zero to enable Timer/Counter1 module.
107
7707D–AVR–07/08
ATMEL [ ATMEL ]
