SH7721 datasheet(587/1524 Pages) RENESAS

587 / 1524 page

Section 15

16-Bit Timer Pulse Unit (TPU)

Rev. 3.00 Jan. 18, 2008 Page 525 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value R/W

Description

TCFU

R/(W)* Underflow Flag

Status flag that indicates that TCNT underflow has occurred

when channels 2, and 3 are set to phase counting mode.

In channels 0 and 1, bit 5 is reserved. It is always read as 0

and cannot be modified.

[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)

TCFV

R/(W)* Overflow Flag

Status flag that indicates that TCNT overflow has occurred.

[Clearing condition]

When 0 is written to TCFV after reading TCFV = 1

[Setting condition]

When the TCNT value overflows (changes from H'FFFF to

H'0000)

TGFD

R/(W)* Compare Flag D

Status flag that indicates the occurrence of TGRD compare

match.

[Clearing conditions]

When 0 is written to TGFD after reading TGFD = 1

[Setting conditions]

When TCNT = TGRD

TGFC

R/(W)* Compare Flag C

Status flag that indicates the occurrence of TGRC compare

match.

[Clearing conditions]

When 0 is written to TGFC after reading TGFC = 1

[Setting conditions]

When TCNT = TGRC

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