68HC11 Timing System
68HC11 Timing System
68HC11 Timing System
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Input Capture Registers<br />
• The Input Capture registers can be used to trap or<br />
store the value of the TCNT counter.<br />
• There are 3 Input Capture Registers in the <strong>68HC11</strong>,<br />
TIC1, TIC2 and TIC3, and they are 16 bit registers. They<br />
are connected to pins PA2, PA1 and PA0 (Input only<br />
pins) at Port A.<br />
• These registers make a capture when an edge occurs<br />
in one of these input pins.<br />
• When a capture is made in one of the registers, the time<br />
of the capture (input capture) is copied from the TCNT<br />
register into the Input Capture Register (TIC).<br />
ELET 3144 R. Alba-Flores 16
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