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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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7477 데이터시트(PDF) 33 Page - Renesas Technology Corp |
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7477 데이터시트(HTML) 33 Page - Renesas Technology Corp |
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33 / 354 page  HARDWARE 1.5 Pin description 7470/7471/7477/7478 GROUP USER’S MANUAL 1-16 Table 1.5.3 Pin description (3) Name Input port P5 Pin P50–P53 Input/ Output Input Functions • Port P5 is a 4-bit input port. • Pull-up transistor can be connected in units of 4-bit. • Pins P50, P51 are in common with input/output pins for sub-clock generating circuit XCIN, XCOUT respectively. • When using pins P50 and P51 as pins XCIN and XCOUT, connect a quartz-crystal oscillator between pins XCIN and XCOUT. • When using pins P50 and P51 as pins XCIN and XCOUT, a feedback resistor is connected between pins XCIN and XCOUT. • To use an external clock input, connect the clock oscillation source to the XCIN pin and leave the XCOUT pin open. Note: Only the 7471/7478 group has pins P50–P53. |
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