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12.2.2
Timer Mode Register (TMDR)
The TMDR is an 8-bit read/write register that sets the operating mode for each channel. The MTU
has five TMDR registers, one for each channel. TMDR is initialized to H'C0 by a power-on reset
or the standby mode. Manual reset does not initialize TMDR.
Channels 0, 3, 4: TMDR0, TMDR3, TMDR4:
Bit:
7
6
5
4
3
2
1
0
—
—
BFB
BFA
MD3
MD2
MD1
MD0
Initial value:
1
1
0
0
0
0
0
0
R/W:
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Channels 1, 2: TMDR1, TMDR2:
Bit:
7
6
5
4
3
2
1
0
—
—
—
—
MD3
MD2
MD1
MD0
Initial value:
1
1
0
0
0
0
0
0
R/W:
R
R
R
R
R/W
R/W
R/W
R/W
•
Bits 7, 6—Reserved: These bits are reserved. They always read as 1, and cannot be modified.
•
Bit 5—Buffer Operation B (BFB): Designates whether to use the TGRB register for normal
operation, or buffer operation in combination with the TGRD register. When using TGRD as a
buffer register, no TGRD register input capture/output compares are generated.
This bit is reserved in channels 1 and 2, which have no TGRD registers. It is always read as 0,
and cannot be modified.
Bit 5: BFB
Description
0
TGRB operates normally (initial value)
1
TGRB and TGRD buffer operation
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