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Bit 7—Count Direction Flag (TCFD): Status flag that shows the direction in which TCNT
counts in channels 1, 2, 4, and 5.
In channels 0 and 3, bit 7 is reserved. It is always read as 1 and cannot be modified.
Bit 7
TCFD
Description
0
TCNT counts down
1
TCNT counts up
Bit 6—Reserved: This bit is always read as 1 and cannot be modified.
Bit 5—Underflow Flag (TCFU): Status flag that indicates that TCNT underflow has occurred
when channels 1, 2, 4, and 5 are set to phase counting mode.
In channels 0 and 3, bit 5 is reserved. It is always read as 0 and cannot be modified.
Bit 5
TCFU
Description
0
[Clearing condition]
When 0 is written to TCFU after reading TCFU = 1
1
[Setting condition]
When the TCNT value underflows (changes from H'0000 to H'FFFF)
Bit 4—Overflow Flag (TCFV): Status flag that indicates that TCNT overflow has occurred.
Bit 4
TCFV
Description
0
[Clearing condition]
When 0 is written to TCFV after reading TCFV = 1
1
[Setting condition]
When the TCNT value overflows (changes from H'FFFF to H'0000 )
436
(Initial value)
(Initial value)
(Initial value)
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