117
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
Figure 15-13. Timer/Counter timing diagram, with prescaler (f
clk_I/O/8).
15.11 Register description
15.11.1
TCCR1A – Timer/Counter1 Control Register A
Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
The COMnA1:0 and COMnB1:0 control the Output Compare pins (OCnA and OCnB respectively) behavior. If one
or both of the COMnA1:0 bits are written to one, the OCnA output overrides the normal port functionality of the I/O
pin it is connected to. If one or both of the COMnB1:0 bit are written to one, the OCnB output overrides the normal
port functionality of the I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit corre-
sponding to the OCnA or OCnB pin must be set in order to enable the output driver.
When the OCnA or OCnB is connected to the pin, the function of the COMnx1:0 bits is dependent of the WGMn3:0
bits setting.
Table 15-2 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to a Normal or a CTC
mode (non-PWM).
TOVn(FPWM)
and ICF n(if used
as TOP)
OCRnx
(update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx value
New OCRnx value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3210
COM1A1
COM1A0
COM1B1
COM1B0
–
WGM11
WGM10
TCCR1A
Read/write
R/W
R
R/W
Initial value
0
0000
Table 15-2.
Compare Output mode, non-PWM.
COMnA1/COMnB1
COMnA0/COMnB0
Description
0
Normal port operation, OCnA/OCnB disconnected
0
1
Toggle OCnA/OCnB on Compare Match
10
Clear OCnA/OCnB on Compare Match (set output to
low level)
11
Set OCnA/OCnB on Compare Match (set output to
high level)