145
7679H–CAN–08/08
AT90CAN32/64/128
14. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
Timer/Counter2 is a general purpose, single channel, 8-bit Timer/Counter module. The main
features are:
14.1 Features
• Single Channel Counter
• Clear Timer on Compare Match (Auto Reload)
• Glitch-free, Phase Correct Pulse Width Modulator (PWM)
• Frequency Generator
• 10-bit Clock Prescaler
• Overflow and Compare Match Interrupt Sources (TOV2 and OCF2A)
• Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock
14.2 Overview
Many register and bit references in this section are written in general form.
• A lower case “n” replaces the Timer/Counter number, in this case 2. However, when using
the register or bit defines in a program, the precise form must be used, i.e., TCNT2 for
accessing Timer/Counter2 counter value and so on.
• A lower case “x” replaces the Output Compare unit channel, in this case A. However, when
using the register or bit defines in a program, the precise form must be used, i.e., OCR2A for
accessing Timer/Counter2 output compare channel A value and so on.
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 14-1. For the actual
placement of I/O pins, refer to Figure 1-2 on page 5 or Figure 1-3 on page 6. 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 “8-bit Timer/Counter Register Description” on page 157.
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