7906 datasheet(125/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-22

7.4 Event counter mode

Fig. 7.4.3 Initial setting example for registers relevant to event counter mode (2)

Setting the count start bit to “1”

Count start register 0

(Address 4016)

Timer A0 count start bit

Timer A1 count start bit

Timer A2 count start bit

Timer A4 count start bit

Count starts.

Continued from preceding

Figure 7.4.2

Setting port P6 and port P2 direction registers

Port P6 direction register (Address 1016)

Pin TA0OUT

Pin TA0IN

Setting interrupt priority level

Timer Aj interrupt control register (j = 0 to 2, 4, 9)

(Addresses 7516 to 7716, 7916, F916)

Interrupt priority level select bits

When using interrupts, set these bits to one of levels

1 to 7.

When disabling interrupts, set these bits to level 0.

Port P2 direction register (Address 816)

Clear the bit corresponding to the TAjIN pin to “0.”

When selecting the TAjOUT pin’s input signal as up-down switching factor,

clear the bit corresponding to the TAjOUT pin to “0.”

When selecting the two–phase pulse signal processing function, clear the

bits corresponding to the TA2OUT, TA4OUT, and TA9OUT pins to “0.”

Pin TA4OUT

Pin TA1OUT

Pin TA1IN

Pin TA4IN

Pin TA2OUT

Pin TA2IN

Pin TA9OUT

Pin TA9IN

Count start register 1

(Address 4116)

Timer A9 count start bit

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