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SH7052 bảng dữ liệu(PDF) 470 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7052 bảng dữ liệu(HTML) 470 Page - Renesas Technology Corp

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14.2.2
Receive Data Register (RDR)
The receive data register (RDR) stores serial receive data. The SCI completes the reception of one
byte of serial data by moving the received data from the receive shift register (RSR) into RDR for
storage. RSR is then ready to receive the next data. This double buffering allows the SCI to
receive data continuously.
The CPU can read but not write to RDR. RDR is initialized to H'00 by a power-on reset, and in
hardware standby mode and software standby mode. It is not initialized by a manual reset.
Bit:
7
6
5
4
3
2
1
0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
14.2.3
Transmit Shift Register (TSR)
The transmit shift register (TSR) transmits serial data. The SCI loads transmit data from the
transmit data register (TDR) into TSR, then transmits the data serially from the TxD pin, LSB (bit
0) first. After transmitting one data byte, the SCI automatically loads the next transmit data from
TDR into TSR and starts transmitting again. If the TDRE bit of SSR is 1, however, the SCI does
not load the TDR contents into TSR.
The CPU cannot read or write to TSR directly.
Bit:
7
6
5
4
3
2
1
0
R/W:
—
—
—
—
—
—
—
—



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