Elan eSL Series, User Manual

Page: 89 / 173

Chapter 3
eSL/eSLS Series (+ eSLZ000) User’s Manual Peripheral Control
••••
77
The Capture Timing
diagram at right shows
an example of a buffer
operation when the
TCCR is set as an
Input-Capture register.
TCNT operates as a
free-running counter,
and TCCP capture
occurs at rising edge,
falling edge, or at both
edges of the input signal.
The TCNT value is
stored in TCCR when
Input-Capture occurs.
TCNT Value
H’FF
Tim er Overflow Interrupt
Flag is s et
Tim er Interrupt Flag is s et
TCCR Value
TCCP Input
H’7F
H’1F
H’1F H’7F
(b) TIOM = 01
TCNT Value
H’FF
Tim er Overflow Interrupt
Flag is s et
Tim er Interrupt Flag is s et
TCCR Value
TCCP Input
H’7F
H’BF
H’1F
H’1F H’7F
(c) TIOM = 1X
TCNT Value
H’FF
Tim er Overflow Interrupt
Flag is s et
Tim er Interrupt Flag is s et
TCCR Value
TCCP Input
H’7F
H’BF
H’1F
H’1F H’BF H’7F
(a) TIOM = 00
H’1F H’BF H’7F
Figure 3-7b Capture Timing Diagram