7721 datasheet(141/577 Pages) RENESAS

tên linh kiện	7721

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

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TIMER A

7721 Group User’s Manual

8–22

8.4 Event counter mode

Fig. 8.4.3 Initial setting example for registers relevant to event counter mode (2)

Setting the count start bit to “1”

Count start register

(Address 4016)

Timer A2 count start bit

Timer A3 count start bit

Timer A4 count start bit

Count starts

From preceding Figure 8.4.2.

Setting port P5 direction register

Port P5 direction register (Address D16)

TA2IN pin

TA3OUT pin

TA3IN pin

TA4OUT pin

TA4IN pin

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

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

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

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

corresponding to the TAjOUT pin to “0.”

TA2OUT pin

Setting interrupt priority level

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

(Addresses 7716 to 7916)

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.

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