h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 301
h8s-2649
Manufacturer Part Number
h8s-2649
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2649.pdf
(766 pages)
- Current page: 301 of 766
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10.3.5
The TSR registers are 8-bit readable/writable registers that indicate the status of each channel. The
TPU has six TSR registers, one for each channel.
Bit
7
6
5
4
Bit Name
TCFD
TCFU
TCFV
Timer Status Register (TSR)
Initial
value
1
1
0
0
R/W
R
R/(W)
R/(W)
Count Direction Flag
Underflow Flag
Overflow Flag
Description
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
Reserved
This bit is always read as 1 and cannot be modified.
Status flag that indicates that TCNT underflow has
occurred when channels 1, 2, 4, and 5 are set to phase
counting mode. Only 0 can be written, for flag clearing.
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
Status flag that indicates that TCNT overflow has
occurred. Only 0 can be written, for flag clearing.
[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
Rev. 2.00 Dec. 05, 2005 Page 263 of 724
Section 10 16-Bit Timer Pulse Unit (TPU)
REJ09B0200-0200
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