Renesas Single-Chip Microcomputer M37531T-ADS Technical Information PDF herunterladen (Seite 39)

MESC TECHNICAL NEWS

No.M16C-39-9911

( 1 / 1)

GRADE

1. Affected devices

• M16C/80 Group, M16C/60 Group, M16C/61 Group, M16C/62 Group (Included 3V version)

• M16C/62A Group (Included 3V version), M16C/6N Group, M16C/6K Group, M16C/6V Group

• M16C/6H Group, M16C/21 Group, M16C/24 Group

2. Cautions

In the case of using “Event counter mode” as “Free-Run type” for timer A, the timer register contents

may be unknown when counting begins. If the timer register is set before counting has started,

then the starting value will be unknown.

This issue will occur only for the “Event counter mode” operating as “Free-Run type”. The value of

the timer register will not be unknown during counting.

3. Countermeasure

(1) In the case where the up/down count will not be changed.

Enable the “Reload” function and write to the timer register before counting begins. Rewrite the

value to the timer register immediately after counting has started.

If counting up, rewrite “000016” to the timer register.

If counting down, rewrite “FFFF16” to the timer register.

This will cause the same operation as “Free-Run type” mode.

(2) In the case where the up/down count has changed.

First set to “Reload type” operation. Once the first counting pulse has occurred, the timer may be

changed to “Free-Run type”.

M16C Family

Cautions for “Event counter mode” with Timer A

Related to M16C/80, M16C/60 series devices.

Related to M16C/20 series devices (except for M30201 group devices).

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 56 57

Keine Kommentare

Renesas Single-Chip Microcomputer M37531T-ADS Technical Information Seite 39