HD64F2638F20J Datasheet, PDF (389/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 10 16-Bit Timer Pulse Unit (TPU)
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
0
1
Description
TCNT counts down
TCNT counts up
(Initial value)
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
0
1
Description
[Clearing condition]
(Initial value)
• When 0 is written to TCFU after reading TCFU = 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
0
1
Description
[Clearing condition]
(Initial value)
• When 0 is written to TCFV after reading TCFV = 1
[Setting condition]
• When the TCNT value overflows (changes from H'FFFF to H'0000 )
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 339 of 1458