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7721 데이터시트(PDF) 208 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

7721 데이터시트(HTML) 208 Page - Renesas Technology Corp

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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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