M30245 datasheet(30/367 Pages) RENESAS

30 / 367 page

Rev.2.00 Oct 16, 2006

page 21 of 354

REJ09B0340-0200

M30245 Group

2. Timer A

Figure 2.2.15. Set-up procedure of event counter mode, free run type selected

Selecting event counter mode and functions

Timer Ai mode register (i=0 to 4) [Address 039616 to 039A16]

TAiMR (i=0 to 4)

Up/down switching cause select bit

0 : Up/down flag's content

Selection of event counter mode

Invalid in event counter mode (i = 0, 1)

Invalid when not using two-phase pulse signal processing(i = 2 to 4)

0 (Must always be “0” in event counter mode)

Count polarity select bit

0 : Counts external signal's falling edge

Up/down flag [Address 038416]

UDF

Timer A0 up/down flag

0 : Down count

Timer A1 up/down flag

0 : Down count

Timer A2 up/down flag

0 : Down count

Timer A3 up/down flag

0 : Down count

Timer A4 up/down flag

0 : Down count

When not using the two-phase pulse signal processing function, set the select bit to “0”.

Setting one-shot start flag and trigger select register

Trigger select register [Address 038316]

TRGSR

One-shot start flag [Address 038216]

ONSF

Timer A0 event/trigger select bit

0 0 : Input on TA0IN is selected (Note 2)

b7 b6

Timer A1 event/trigger select bit

0 0 : Input on TA1IN is selected (Note 2)

b1 b0

Timer A2 event/trigger select bit

0 0 : Input on TA2IN is selected (Note 2)

b3 b2

Timer A3 event/trigger select bit

0 0 : Input on TA3IN is selected (Note 2)

b5 b4

Timer A4 event/trigger select bit

0 0 : Input on TA4IN is selected (Note 2)

b7 b6

Note 2: Set the corresponding port direction register to “0”.

Setting divide ratio

Can be set to 000016 to FFFF16

(b15)

(b8)

Start count

Setting count start flag

Timer A0 count start flag

Timer A1 count start flag

Timer A2 count start flag

Timer A3 count start flag

Timer A4 count start flag

Setting up/down flag

Count operation type select bit (Note 1)

1 : Free-run type

Pulse output function select bit

0 : Pulse is not output (TAi OUT pin is a normal port pin)

Note 1: First set to “Reload type” operation. Once the first counting pulse has occurred, the timer may be changed to “Free-Run type”.

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