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7721 데이터시트(PDF) 141 Page - Renesas Technology Corp

부품명 7721
상세설명  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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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”
b7
b0
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
b7
b0
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
b7
b0
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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