Rev. 1.0, 09/01, page 526 of 904
11.3.5
Timer Status Register (TSR)
TSR registers indicate the status of each channel. The TPU has six TSR registers, one for each
channel.
Bit
Bit Name
Initial value
R/W
Description
7
TCFD
1
R
Count Direction Flag
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.
0: TCNT counts down
1: TCNT counts up
6
–
1
–
Reserved
This bit is always read as 1 and cannot be modified.
5
TCFU
0
R/(W)
*
Underflow Flag
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.
[Setting condition]
When the TCNT value underflows (changes from
H'0000 to H'FFFF)
[Clearing condition]
When 0 is written to TCFU after reading TCFU = 1
4
TCFV
0
R/(W)
*
Overflow Flag
Status flag that indicates that TCNT overflow has
occurred.
[Setting condition]
When the TCNT value overflows (changes from
H'FFFF to H'0000)
[Clearing condition]
When 0 is written to TCFV after reading TCFV = 1
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