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8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
15. 8-bit Timer/Counter0 with PWM
15.1 Features
• Two Independent Output Compare Units
• Double Buffered Output Compare Registers
• Clear Timer on Compare Match (Auto Reload)
• Glitch Free, Phase Correct Pulse Width Modulator (PWM)
• Variable PWM Period
• Frequency Generator
• Three Independent Interrupt Sources (TOV0, OCF0A, and OCF0B)
15.2 Overview
Timer/Counter0 is a general purpose 8-bit Timer/Counter module, with two independent Output
Compare Units, and with PWM support. It allows accurate program execution timing (event man-
agement) and wave generation.
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 15-1. For the actual
placement of I/O pins, refer to ”Pinout ATmega48A/PA/88A/PA/168A/PA/328/P” on page 2. 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 locations are listed in the ”Register Description” on page 108.
The PRTIM0 bit in ”Minimizing Power Consumption” on page 43 must be written to zero to
enable Timer/Counter0 module.
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