HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 234

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

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
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 1: OS1
0
1
226
Bit 2: OS2
0
1
0
1
Bit 0: OS0
0
1
0
1
Description
Clearing conditions:
After reading OVF = 1, cleared by writing 0 to OVF
Setting conditions:
Set when TCNTV overflows from H'FF to H'00
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
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)
(initial value)
(initial value)