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Bits 3 and 2—Output/Input Capture Edge Select B3 and B2 (OIS3, OIS2): In combination
with the ICE bit in TCSR1 (TCSR3), these bits select the compare match B output level or the
input capture input detected edge.
The function of TCORB1 (TCORB3) depends on the setting of bit 4 of TCSR1 (TCSR3).
TCORB0 and TCORB2 function as compare match registers regardless of the setting of bit 4 of
TCSR1 (TCSR3).
ICE Bit in
TCSR1
Bit 3
Bit 2
(TCSR3)
OIS3
OIS2 Description
0
0
0
1
1
0
1
1
0
0
1
1
0
1
• When the compare match register function is used, the timer output priority order is: toggle
output > 1 output > 0 output.
• If compare match A and B occur simultaneously, the output changes in accordance with the
higher-priority compare match.
• When bits OIS3, OIS2, OS1, and OS0 are all cleared to 0, timer output is disabled.
Bits 1 and 0—Output Select A1 and A0 (OS1, OS0): These bits select the compare match A
output level.
Bit 1
Bit 0
OS1
OS0
Description
0
0
No change when compare match A occurs
1
0 is output when compare match A occurs
1
0
1 is output when compare match A occurs
1
Output is inverted when compare match A occurs (toggle output)
• When the compare match register function is used, the timer output priority order is: toggle
output > 1 output > 0 output.
No change when compare match B occurs
0 is output when compare match B occurs
1 is output when compare match B occurs
Output is inverted when compare match B occurs (toggle output)
TCORB input capture on rising edge
TCORB input capture on falling edge
TCORB input capture on both rising and falling edges
Section 10 8-Bit Timers
Rev. 4.00 Jan 26, 2006 page 411 of 938
(Initial value)
(Initial value)
REJ09B0276-0400
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