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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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7721 Scheda tecnica(PDF) 208 Page - Renesas Technology Corp |
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7721 Scheda tecnica(HTML) 208 Page - Renesas Technology Corp |
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208 / 577 page  SERIAL I/O 7721 Group User’s Manual 11–5 (1) Internal/External clock select bit (bit 3) s Clock synchronous serial I/O mode By clearing this bit to “0” in order to select an internal clock, the clock which is selected with the BRG count source select bits (bits 0 and 1 at addresses 3416, 3C16) becomes the count source of the BRGi (described later). The BRGi’s output divided by 2 becomes the transfer clock. Additionally, the transfer clock is output from the CLKi pin. By setting this bit to “1” in order to select an external clock, the clock input to the CLKi pin becomes the transfer clock. s UART mode By clearing this bit to “0” in order to select an internal clock, the clock which is selected with the BRG count source select bits (bits 0 and 1 at addresses 3416, 3C16) becomes the count source of the BRGi (described later). Then, the CLKi pin functions as a programmable I/O port. By setting this bit to “1” in order to select an external clock, the clock input to the CLKi pin becomes the count source of BRGi. Always in the UART mode, the BRGi’s output divided by 16 becomes the transfer clock. 11.2 Block description |
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