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10.2.2
Time Constant Registers A (TCORA)
Bit
15
14
Initial value
1
1
Read/Write
R/W
R/W
Bit
15
14
Initial value
1
1
Read/Write
R/W
R/W
TCORA0 to TCORA3 are 8-bit readable/writable registers. The TCORA0 and TCORA1 pair, and
the TCORA2 and TCORA3 pair, can each be accessed as a 16-bit register by word access.
The TCORA value is constantly compared with the TCNT value. When a match is detected, the
corresponding compare match flag A (CMFA) is set to 1 in TCSR.
The timer output can be freely controlled by these compare match signals and the settings of
output select bits 1 and 0 (OS1, OS0) in TCSR.
Each TCORA register is initialized to H'FF by a reset and in standby mode.
TCORA0
13
12
11
10
1
1
1
1
R/W
R/W
R/W
R/W
R/W
TCORA2
13
12
11
10
1
1
1
1
R/W
R/W
R/W
R/W
R/W
9
8
7
6
5
1
1
1
1
1
R/W
R/W
R/W
R/W
9
8
7
6
5
1
1
1
1
1
R/W
R/W
R/W
R/W
Rev. 4.00 Jan 26, 2006 page 403 of 938
Section 10 8-Bit Timers
TCORA1
4
3
2
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
TCORA3
4
3
2
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
REJ09B0276-0400
0
1
0
1
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