Bits 3 and 2—Reserved: Read-only bits, always read as 1.
Bit 1—Output Level Select 4 (OLS4): Selects output levels in complementary PWM mode and
reset-synchronized PWM mode.
Bit 1
OLS4
Description
0
TIOCA
3
, TIOCA
4
, and TIOCB
4
outputs are inverted
1
TIOCA
3
, TIOCA
4
, and TIOCB
4
outputs are not inverted
(Initial value)
Bit 0—Output Level Select 3 (OLS3): Selects output levels in complementary PWM mode and
reset-synchronized PWM mode.
Bit 0
OLS3
Description
0
TIOCB
3
, TOCXA
4
, and TOCXB
4
outputs are inverted
1
TIOCB
3
, TOCXA
4
, and TOCXB
4
outputs are not inverted
(Initial value)
10.2.7 Timer Counters (TCNT)
TCNT is a 16-bit counter. The ITU has five TCNTs, one for each channel.
Channel
Abbreviation
Function
0
TCNT0
Up-counter
1
TCNT1
2
TCNT2
Phase counting mode: up/down-counter
Other modes: up-counter
3
TCNT3
4
TCNT4
Each TCNT is a 16-bit readable/writable register that counts pulse inputs from a clock source. The
clock source is selected by bits TPSC2 to TPSC0 in TCR.
Bit
Initial value
Read/Write
14
0
R/W
12
0
R/W
10
0
R/W
8
0
R/W
6
0
R/W
0
0
R/W
4
0
R/W
2
0
R/W
15
0
R/W
13
0
R/W
11
0
R/W
9
0
R/W
7
0
R/W
1
0
R/W
5
0
R/W
3
0
R/W
Complementary PWM mode: up/down-counter
Other modes: up-counter
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