ATmega162 datasheet(108/324 Pages) ATMEL

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108

2513K–AVR–07/09

ATmega162/V

The Input Capture Register can capture the Timer/Counter value at a given external (edge trig-

gered) event on either the Input Capture pin (ICPn) or on the Analog Comparator pins (See

“Analog Comparator” on page 195.) The Input Capture unit includes a digital filtering unit (Noise

Canceler) for reducing the chance of capturing noise spikes.

The TOP value, or maximum Timer/Counter value, can in some modes of operation be defined

by either the OCRnA Register, the ICRn Register, or by a set of fixed values. When using

OCRnA as TOP value in a PWM mode, the OCRnA Register can not be used for generating a

PWM output. However, the TOP value will in this case be double buffered allowing the TOP

value to be changed in run time. If a fixed TOP value is required, the ICRn Register can be used

as an alternative, freeing the OCRnA to be used as PWM output.

Definitions

The following definitions are used extensively throughout the section:

Compatibility

The 16-bit Timer/Counter has been updated and improved from previous versions of the 16-bit

AVR Timer/Counter. This 16-bit Timer/Counter is fully compatible with the earlier version

regarding:

•

All 16-bit Timer/Counter related I/O Register address locations, including Timer Interrupt

Registers.

•

Bit locations inside all 16-bit Timer/Counter Registers, including Timer Interrupt Registers.

•

Interrupt Vectors.

The following control bits have changed name, but have same functionality and register location:

•

PWMn0 is changed to WGMn0.

•

PWMn1 is changed to WGMn1.

•

CTCn is changed to WGMn2.

The following bits are added to the 16-bit Timer/Counter Control Registers:

•

FOCnA and FOCnB are added to TCCRnA.

•

WGMn3 is added to TCCRnB.

The 16-bit Timer/Counter has improvements that will affect the compatibility in some special

cases.

Table 52. Definitions

BOTTOM

The counter reaches the BOTTOM when it becomes 0x0000.

MAX

The counter reaches its MAXimum when it becomes 0xFFFF (decimal

65535).

TOP

The counter reaches the TOP when it becomes equal to the highest

value in the count sequence. The TOP value can be assigned to be one

of the fixed values: 0x00FF, 0x01FF, or 0x03FF, or to the value stored in

the OCRnA or ICRn Register. The assignment is dependent of the mode

of operation.

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