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CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER
8.7 Operation of Counter Functions
This section describes the operation of the 8/16-bit capture timer/counter function.
■ Counter Function Operation
● 8-bit mode
To operate timer 0 as the counter function in the 8-bit mode, the function must be set as shown in Figure
8.7-1 .
Figure 8.7-1 Setting of Counter Function in 8-bit Mode
Counter function operation in the 8-bit mode is the same as interval timer function (timer 0 in
8-bit mode) operation except that the external clock is used instead of the internal clock.
The number of events can be known by reading the capture data register (TCPL). A specific number of
events can be known by the event count detection function.
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
DDR3
0
TCCR CPIF CFCLR
CPIEN
CCMSK TCMSK EDGS1
EDGS0 RESV
TCR1 TIF1
TFCR1
T1IEN TCS12
TCS11
TCS10 TSTR1
TCR0 TIF0 TFCR0 T0IEN CINV TCS02
TCS01
TCS00 TSTR0
111
TCR2 PEN TSEL
TCDL
TDR0
: Used bit
: Unused bit
0 : Set "0"
1 : Set "1"
Setting of 00
Setting of a value
other than 111
Number of detected events
Setting of the counter value to be compared