HD6433644R datasheet(242/549 Pages) RENESAS

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Section 9 Timers

Rev. 6.00 Sep 12, 2006 page 222 of 526

REJ09B0326-0600

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

Description

Clearing condition:

After reading OVF = 1, cleared by writing 0 to OVF

(initial value)

Setting condition:

Set when TCNTV overflows from H'FF to H'00

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

Bit 2: OS2

Description

No change at compare match B

(initial value)

0 output at compare match B

1 output at compare match B

Output toggles at compare match B

Bit 1: OS1

Bit 0: OS0

Description

No change at compare match A

(initial value)

0 output at compare match A

1 output at compare match A

Output toggles at compare match A

HD6433644R Datasheet(PDF) 242 Page - Renesas Technology Corp

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