Jameco Electronics 2000 ユーザーズマニュアル

The input capture channels are used to determine the time at which an event takes place. 
An event is signaled by a rising or falling edge (or optionally by either edge) on one of 16 
input pins that can be selected as input for either of the two channels. A 16 bit counter is 
used to record the time at which the event takes place. The counter is driven by the output 
of Timer A8 and can be set to count at a rate ranging from full clock speed to 1/256 the 
clock speed.

Two events are recognized: a start condition and a stop condition. The start condition may 
be used to start counting and the stop condition to stop counting. However the counter 
may also run continuously or run until a stop condition is encountered. The start and stop 
conditions may also be used to latch the current time at the instant the condition occurs 
rather than actually start or stop the counter. The same pin may be used to detect the start 

A1

A2

Timer A System

match reg

match reg

compare

Timer B System

match preload

match preload

10 bits

Timer_B1

Timer_B2

A3

A4

A5

A6

A7

 

perclk

perclk

perclk/2

10-bit counter

A8

Serial E

Serial F

Serial A

Serial B

Serial C

Serial D

Input
Capture

PWM

Quadrature
Decode

A9

A10

Timer A1

perclk/2

perclk/8

Control Timer 
Synchronized 
outputs