HD64F3644PV Datasheet, PDF (244/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 Timers
Bit 5Timer Overflow Flag (OVF): Bit 5 is a status flag indicating that TCNTV has overflowed
from H'FF to H'00. This flag is set by hardware and cleared by software. It cannot be set by
software.
Bit 5: OVF
0
1
Description
Clearing condition:
After reading OVF = 1, cleared by writing 0 to OVF
Setting condition:
Set when TCNTV overflows from H'FF to H'00
(initial value)
Bit 4Reserved Bit: Bit 4 is reserved; it is always read as 1, and cannot be modified.
Bits 3 to 0Output Select 3 to 0 (OS3 to OS0): Bits 3 to 0 select the way in which the output
level at the TMOV pin changes in response to compare match between TCNTV and TCORA or
TCORB.
OS3 and OS2 select the output level for compare match B. OS1 and OS0 select the output level
for compare match A. The two levels can be controlled independently.
If two compare matches occur simultaneously, any conflict between the settings is resolved
according to the following priority order: toggle output > 1 output > 0 output.
When OS3 to OS0 are all cleared to 0, timer output is disabled.
After a reset, the timer output is 0 until the first compare match.
Bit 3: OS3
0
1
Bit 2: OS2
0
1
0
1
Description
No change at compare match B
0 output at compare match B
1 output at compare match B
Output toggles at compare match B
(initial value)
Bit 1: OS1
0
1
Bit 0: OS0
0
1
0
1
Description
No change at compare match A
0 output at compare match A
1 output at compare match A
Output toggles at compare match A
(initial value)
Rev. 6.00 Sep 12, 2006 page 222 of 526
REJ09B0326-0600