M30620FCAFP datasheet(342/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-25

Figure 2.2.19. Set-up procedure of 2-phase pulse signal process in event counter mode, multiply-by-4 mode selected

Setting counter value

Can be set to 000016 to FFFF16

(b15)

(b8)

Timer A3 register [Address 038D16, 038C16]TA3

Timer A4 register [Address 038F16, 038E16]TA4

Start count

Selecting event counter mode and functions

0 (Must always be “0” when using two-phase pulse signal processing)

Timer Ai mode register (i= 3, 4) [Address 039916, 039A16]

TAiMR (i= 3, 4)

1 (Must always be “1” when using two-phase pulse signal processing)

Selection of event counter mode

Two-phase pulse signal processing operation select bit (Note 1)

1 : Multiply-by-4 processing operation

Count operation type select bit

1 : Free-run type

0 (Must always be “0” when using two-phase pulse signal processing)

Setting two-phase pulse signal processing select bit

Up/down flag [address 038416]

UDF

Timer A3 two-phase pulse signal processing select bit (Note 2)

1 : Two-phase pulse signal processing enabled

Timer A4 two-phase pulse signal processing select bit (Note 2)

1 : Two-phase pulse signal processing enabled

Setting count start flag

Count start flag [Address 038016]

TABSR

Timer A3 count start flag

Timer A4 count start flag

Note 1: This bit is valid for timer A3 mode register. For timer A4 mode register, this bit can be “0” or “1”.

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

Setting trigger select register

Timer A4 event/trigger select bit

b7 b6

0 0 : Input on TA4IN is selected (Note 3)

Timer A3 event/trigger select bit

b5 b4

0 0 : Input on TA3IN is selected (Note 3)

Note 3: Set the corresponding port direction register to “0”.

Trigger select register [Address 038316]

TRGSR

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