Timer Status Register (Tsr) - Renesas H8S/2100 Series Hardware Manual

Section 10 16-Bit Timer Pulse Unit (TPU)
10.3.5

Timer Status Register (TSR)

The TSR registers indicate the status of each channel. The TPU has three TSR registers, one for
each channel.
Bit Bit Name
7 TCFD

6
5 TCFU
4 TCFV
Rev. 1.00 Apr. 28, 2008 Page 260 of 994
REJ09B0452-0100
Initial
value R/W Description
1 R Count Direction Flag
Status flag that shows the direction in which TCNT
counts in channel 1 and 2. In channel 0, bit 7 is
reserved. It is always read as 0 and cannot be modified.
0: TCNT counts down
1: TCNT counts up
1 R Reserved
This bit is always read as 1 and cannot be modified.
0 R/(W)* Underflow Flag
Status flag that indicates that TCNT underflow has
occurred when channels 1 and 2 are set to phase
counting mode.
In channel 0, bit 5 is reserved. It is always read as 0
and cannot be modified.
[Setting condition]
When the TCNT value underflows (change from H'0000
to H'FFFF)
[Clearing condition]
When 0 is written to TCFU after reading TCFU = 1
0 R/(W) * Overflow Flag
Status flag that indicates that TCNT overflow has
occurred.
[Setting condition]
When the TCNT value overflows (change from H'FFFF
to H'0000)
[Clearing condition]
When 0 is written to TCFV after reading TCFV = 1