ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 110

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

16-bit Timer/Counter
(Timer/Counter1 and
Timer/Counter3)
Restrictions in ATmega103
Compatibility Mode
Overview
110
ATmega64(L)
The 16-bit Timer/Counter unit allows accurate program execution timing (event man-
agement), wave generation, and signal timing measurement. The main features are:
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Note that in ATmega103 compatibility mode, only one 16-bit Timer/Counter is available
(Timer/Counter1). Also note that in ATmega103 compatibility mode, the Timer/Counter1
has two compare registers (Compare A and Compare B) only.
Most register and bit references in this datasheet are written in general form. A lower
case “n” replaces the Timer/Counter number, 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). The physical I/O Register and bit locations for ATmega64 are listed in the
“16-bit Timer/Counter Register Description” on page 131.
A simplified block diagram of the 16-bit Timer/Counter is shown in Figure 46. CPU
accessible I/O Registers, including I/O bits and I/O pins, are shown in bold.
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
Ten Independent Interrupt Sources (TOV1, OCF1A, OCF1B, OCF1C, ICF1, TOV3, OCF3A,
OCF3B, OCF3C, and ICF3)
2490G–AVR–03/04