The following definitions are used extensively throughout the document:
| 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 OCR1A or ICR1 Register. The assignment is dependent of the mode of operation. |