7702 datasheet(111/217 Pages) RENESAS

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TIMER A

7702/7703 Group User’s Manual

5–23

5.4 Event counter mode

Setting the count start bit to “1”

Count start register

(Address 4016)

Timer A0 count start bit

Timer A1 count start bit

Timer A2 count start bit

Timer A3 count start bit

Timer A4 count start bit

Count starts

From preceding Figure 5.4.2.

Setting port P5 and port P6 direction registers

Port P5 direction register (Address D16)

TA0IN pin

TA1OUT pin

TA1IN pin

TA2OUT pin

TA2IN pin

TA3OUT pin

Port P6 direction register (Address 1016)

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

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

bit corresponding to the TAiOUT pin to “0.”

When selecting the two–phase pulse signal processing function, set the bit

corresponding to the TAjOUT (j = 2 to 4) pin to “0.”

TA4OUT pin

TA4IN pin

TA3IN pin

TA0OUT pin

Setting interrupt priority level

Timer Ai interrupt control register (i = 0 to 4)

(Addresses 7516 to 7916)

Interrupt priority level select bits

When using interrupts, set these bits

to level 1-7.

When disabling interrupts, set these

bits to level 0.

Fig. 5.4.3 Initial setting example for registers relevant to event counter mode (2)

7702 Datasheet(PDF) 111 Page - Renesas Technology Corp